Bombardier Doesn’t Seem Too Disappointed On Missing Out On The Abellio East Midlands Railway Order
This article on the Derby Telegraph is entitled Derby’s Bombardier Misses Out On Big Contract To Supply Trains For The East Midlands.
This is two paragraphs from the article.
In a statement, Bombardier said: “Bombardier is clearly disappointed that we have not been selected to supply bi-mode trains for the East Midlands franchise.
“We believe we submitted a competitive bid – on technology, strength of product, deliverability and cost, and will seek formal feedback from Abellio.”
There certainly hasn’t been any published threat of legal action.
The Abellio East Midlands Railway Order From Hitachi.
The order placed was as follows.
Thirty-three five-car AT-300 trains.
- 25 KVAC overhead electrification.
- Four cars have underfloor diesel-engines.
- 125 mph running.
- 24 metre cars.
- Ability to work in pairs.
- Evolution of a Class 802 train.
- A new nose.
It is a £400 million order.
No Trains For Corby
In How Will Abellio East Midlands Railway Maximise Capacity On The Midland Main Line?, I calculated that the current timetable to Derby, Nottingham and Sheffield would need thirty-two trains.
So thirty-three trains would only be enough trains for the bi-mode services to the three Northern termini.
So it looks like Hitachi are not providing any trains for the Corby services! Surely, to have a compatible fleet from one manufacturer would be of an advantage to Abellio East Midlands Railway.
An Ideal Fleet For Corby
Trains between London and Corby take around 70-75 minutes, with a round trip taking three hours.
This means that to run a one train per hour (tph) service to Corby needs three trains and a two tph service will need six trains.
As trains go wrong and also need servicing, I would add at least one spare train, but two is probably preferable.
It would have the following characteristics.
- All electric.
- 125 mph running, as they will need to keep out of the way of the Hitachi bi-modes.
- 240 metres long.
- A passenger-friendly interior, with loys of tables.
- Energy efficient
If the last point s to be met, I and many other engineers believe that to save energy, trains must have regenerative braking to batteries on the train.
In Kinetic Energy Of A Five-Car Class 801 Train, I calculated that the kinetic energy of a Class 801 train, with every seat taken was 104.2 kWh
This calculation was performed for a half-length train, so a full electric train for London and Corby would have a kinetic energy of 208.4 kWh, if it was similar to one of Hitachi’s Class 801 train.
The reason the kinetic energy of a train is important, is teat if a train brakes from full speed and has batteries to handle the energy generated by regenerative braking, the batteries must be big enough to handle all the energy.
So a ten-car train similar in capacity and weight to a Class 801 train would need batteries capable of handling 208.4 kWh.
I’ll give a simple example.
A train similar to a Class 801, is full and running using electrification at 125 mph. It is approaching a station, where it will stop.
- The train’s computer knows the mass and velocity of the train at all times and hence the kinetic energy can be calculated.
- The train’s computer will constantly manage the train’s electricity supply, so that the batteries always have sufficient capacity to store any energy generated by braking.
- As the train brakes, the energy generated will be stored in the batteries.
- As the train moves away from the station, the train’s computer will use energy from the overhead electrification or batteries to accelerate the train.
Energy will constantly be recycled between the traction motors and the batteries.
I don’t know what battery capacity would be needed, but in my experience, perhaps between 300-400 kWh would be enough.
Any better figures, gratefully accepted.
When you consider that the battery in a Tesla car is around 60-70 kWh, I don’t think, there’ll be too much trouble putting enough battery power underneath a ten-car train.
Onward To Melton Mowbray
This page on the Department for Transport web site is an interactive map of the Abellio’s promises for East Midlands Railway.
These are mentioned for services to Oakham and Melton Mowbray.
- After electrification of the Corby route there will continue to be direct service each way between London and Oakham and Melton Mowbray once each weekday, via Corby.
- This will be operated with brand new 125mph trains when these are introduced from April 2022.
This seems to be a very acceptable minimum position.
Surely, in a real world driven by marketing and finance and more and more passengers wanting to travel regularly by train to places like London, Luton Airport and Leicester, there will come a time, when an hourly service on this route is needed.
Could a Corby service be extended to Melton Mowbray using battery power, at perhaps a slower speed of 90 mph?
Accelerating away from Corby, the train would need 108 kWh of energy to get to 90 mph with a full train.
- There would be a continuation of the electrification for perhaps a couple of hundred metres after Corby station.
- The train would probably leave Corby with a full battery, which would have been charged on the journey from London.
Once at cruising speed, the train would need energy to maintain line speed and provide hotel power.
In How Much Power Is Needed To Run A Train At 125 mph?, I calculated the figure for some high-speed trains.
This was my conclusion.
In future for the energy use of a train running at 125 mph, I shall use a figure of three kWh per vehicle mile.
So I will use that figure, although I suspect the real figure could be lower.
I will also assume.
- Corby to Melton Mowbray is 26.8 miles.
- It’s a ten-car train.
- Regenerative braking is seventy percent efficient.
- The train is running at 90 mph, between Cotby and Melton Mowbray, with an energy of 108 kWh
Energy use on a round trip between Corby and Melton Mowbray, would be as follows.
- Accelerating at Corby – 108 kWh – Electrification
- Stop at Oakham – 32.4 kWh – Battery
- Corby to Melton Mowbray – 804 kWh – Battery
- Stop at Melton Mowbray – 32.4 kWh – Battery
- Stop at Oakham – 32.4 kWh – Battery
- Melton Mowbray to Corby – 804 kWh – Battery
This gives a total of 1705.2 kWh
The battery energy need gets a lot more relaxed, if there is a charging station at Melton Mowbray, as the train will start the return journey with a full battery.
Energy use from Corby to Melton Mowbray would be as follows.
- Accelerating at Corby – 108 kWh – Electrification
- Stop at Oakham – 32.4 kWh – Battery
- Corby to Melton Mowbray – 804 kWh – Battery
This gives a total of 836.4 kWh.
Energy use from Melton Mowbray to Corby would be as follows.
- Accelerating at Melton Mowbray- 108 kWh – Battery
- Stop at Oakham – 32.4 kWh – Battery
- Melton Mowbray to Corby – 804 kWh – Battery
This gives a total of 944.4 kWh.
The intriguing fact, is that if you needed a train to go out and back from Corby to Melton Mowbray, it needs a battery twice the size of one needed, if you can charge the train at Melton Mowbray., during the stop of several minutes.
Charging The Train
This page on the Furrer and Frey web site, shows a charging station..
It might also be possible to erect a short length of 25 KVAC overhead electrification. This would also help in accelerating the train to line speed.
This Google Map shows Melton Mowbray station.
It looks to be a station on a large site with more than adequate car parking and I suspect building a bay platform with charging facilities would not be the most difficult of projects.
More Efficient Trains
I also think that with good design electricity use can be reduced from my figure of 3 kWh per vehicle mile and the regenerative braking efficiency can be increased.
Obviously, the more efficient the train, the greater the range for a given size of battery.
Onward To Leicester
If the train service can be extended by the 26.8 miles between Corby and Melton Mowbray, I wonder if the electric service can be extended to Leicester.
Under current plans the Northern end of the electrification will be Market Harborough.
In Market Harborough Station – 11th July 2019, I wrote about the station after a visit. In my visit, I notices there were a lot of croaaovers to the North of the station.
As it was a new track alignment, I suspect that they were new.
So is it the interntion to turnback services at Market Harborough or are the crossovers preparation for links to stabling sidings?
It got me asking if battery-electric trains could reach Leicester.
- Leicester and Market Harborough are only fourteen miles apart.
- There are no stops in between.
- Using my three kwH per vehicle mile, this would mean that a ten car train would use 420 kWh between the two stations at 125 mph.
I certainly believe that a Northbound train passing Market Harborough with fully-charged batteries could reach Leicester, if it had an adequate battery of perhaps 700 kWh.
As at Melton Mowbray, there would probably need to be a charging station at Leicester.
The picture shows the station from the Northern bridge.
The platforms shown are the two main lines used by most trains. On the outside are two further lines and one or both could be fitted with a charging station, if that were necessary.
An Example Electric Service Between London And Leicester
If they so wanted, Abellio East Midlands Railway could run 125 mph battery-electric services between London and Leicester.
The Current Timings
The fastest rains go North in around 66-67 minutes and come South in seventy.
So a round trip would take around two and a half hours.
Five trains would be needed for a half-hourly service.
I feel it would be very feasible, if Abellio East Midlands Railway wanted to increase services between London and Leicester, then this could be done with a fleet of zero-carbon battery-electric trains, using battery power between Leicester and Market Harborough.
A Non-Stop London And Leicester Service
I wonder what would be the possible time for an electric express running non-stop between London and Leicester.
- Currently, some diesel Class 222 trains are timetabled to achieve sixty-two minutes.
- Linespeed would be 125 mph for much of the route.
- There is no reason, why the fourteen mile section without electrification North of Market Harborough couldn’t be run at 1235 mph on battery-power, once the track is upgraded to that speed.
- iIn the future, modern digital signalling, as used by Thameslink, could be applied to the whole route and higher speeds of up to 140 mph may be possible.
I wouldn’t be surprised to see a battery-electric train travelling between London and Leicester in fifty minutes before 2030.
A fifty-minute service would result in a two-hour round trip and need just two trains for a frequency of two tph.
It would surely be a marketing man’s dream.
It should be noted that Abellio has form in this area and have introduced Norwich-in-Ninrty services on the slower London and Norwich route.
London And Leicester Via Corby, Oakham And Melton Mowbray
I have been very conservative in my calculations of battery size.
With real data on the terrain, the track profile, the train energy consumption, regenerative braking performance and the passengers, I do wonder, if it would be possible to run on battery power between Corby and Leicester via Oakham and Melton Mowbray.
- The distance would be 62 miles on battery power.
- Trains could serve Syston station.
- Using times of current services London and Leicester would take two hours fifteen minutes.
I suspect it would be possible, but it would be a slow service.
Would These Services Be An Application For Bombardier’s 125 mph Bi-Mode Aventra With Batteries?
Could Bombardier’s relaxed reaction to not getting the main order, be because they are going to be building some of their proposed 125 mph bi-mode trains with batteries, that will be able to work the following routes?
- London and Melton Mowbray via Corby and Oakham.
- London and Leicester via Market Harborough.
But I think that the main emphasis could be on a non-stop high-speed service between London and Leicester.
I have been suspicious that there is more to Bombardier’s proposed train than they have disclosed and wrote Is Bombardier’s 125 mph Bi-Mode Aventra With Batteries, A 125 mph Battery-Electric Aventra With Added Diesel Power To Extend The Range?
Since I wrote that article, my view that Bombardier’s train is a battery-electric one, with diesel power to extend the range, has hardened.
These Midland Main Line trains will run in two separate modes.
- On the Southern electrified sections, the trains will be 125 mph electric trains using batteries for regenerative braking, energy efficiency and emergency power in the case of overhead line failure..
- On the Northern sections without electrification,the trains will be battery-electric trains running at the maximum line-speed possible, which will be 125 mph on Leicester services.
There will be an optimum battery size, which will give the train the required performance.
Is there any need for any diesel engines?
Quite frankly! No! As why would you lug something around that you only need for charging the batteries and perhaps overhead supply failure?
- Batteries would only need to be charged at the Northern end of the routes. So use a chasrging station, if one is needed!
- Batteries can handle overhead supply failure, automatically.
Who needs bi-modes?
How Big Would The Batteries Need To Be?
A full train would have a kinetic energy of around 200 kWh and I said this about battery capacity for handling the energy from regenerastive braking.
I don’t know what battery capacity would be needed, but in my experience, perhaps between 300-400 kWh would be enough.
Any better figures, gratefully accepted.
To handle Corby to Melton Mowbray and back, I estimated that 1,800 kWh would be needed, but if the train had a top-up at Melton Mowbray a capacity of 1,000 kWh would be sufficient.
Pushed, I would say, that a battery capacity of 2,000 kWh would be sufficient to run both routes without a charging station, at the Northern end.
I also believe the following will happen.
- Trains will get more efficient and leighter in weight.
- Batteries will increase their energy density.
- Charging stations will charge trains faster.
- Battery costs will fall.
This would mean that larger battery capacities can be achieved without the current weight and cost penalty and the achievable range after the end of the wires will increase.
I wouldn’t be surprised to see ranges of over fifty miles in a few years, which with a charging station at the destination, means battery-electric trains could venture fifty miles from an electrified line.
A few other suggested routes.
- Ashford and Southampton
- Birmingham and Stansted Airport
- Carliswle and Newcastle
- Doncaster and Peterborough via Lincoln (CS)
- Edinburgh and Tweedbank (CS)
- London Euston and Chester
- London St. Pancras and Hastings
- London Waterloo and Salisbury (CS)
- Manchester and Sheffield (CS)
- Norwich and Nottingham (CS)
- York and Hull via Scarborough (CS)
Note.
- Stations marked (CS) would need a charging station.
- Some routes would only need 100 mph trains.
I think that a 125 mph battery train will have a big future.
Conclusion
I have a feeling that Bombardier are right to be not too disappointed.
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Could A 125 Mph Electric Train With Batteries Handle The Midland Main Line?
In Bombardier’s 125 Mph Electric Train With Batteries, I investigated a pure electric train based on Bombardier’s proposed 125 mph bi-mode Aventra with batteries.
It would have the following characteristics.
- Electric power on both 25 KVAC overhead and 750 VDC third-rail.
- Appropriately-sized batteries.
- 125 mph running, where possible on electrification and/or battery power.
- Regenerative braking using the batteries.
- Low energy interiors and systems.
It would be a train with efficiency levels higher than any train seen before.
It would also be zero-carbon at the point of delivery.
An Example 125 mph Train
I will use the same size and specification of train, that I used in Bombardier’s 125 Mph Electric Train With Batteries.
- The train is five cars, with say four motored cars.
- The empty train weighs close to 180 tonnes.
- There are 430 passengers, with an average weight of 90 Kg each, with baggage, bikes and buggies.
- This gives a total train weight of 218.7 tonnes.
- The train is travelling at 200 kph or 125 mph.
Travelling at 200 kph, the train has an energy of 94.9 kWh.
I will also assume.
- The train uses 15 kWh per mile to maintain the required line speed and power the train’s systems.
- Regenerative braking is eighty percent efficient.
I will now do a few calculations.
Kettering To Leicester
Suppose one of the proposed trains was running between St. Pancras and Leicester.
- I’m assuming there are no stops.
- In a year or two, it should be able to run as far as Kettering using the new and improved 25 KVAC overhead electrification.
- The train would leave the electrification at Kettering with a full charge in the batteries.
- The train would also pass Kettering as close to the line speed as possible.
- Hopefully, the twenty-nine miles without electrification between Kettering and Leicester will have been updated to have the highest possible line speed, with many sections capable of supporting 125 mph running.
I can do a rough-and-ready calculation, as to how much energy has been expended between Kettering and Leicester.
- Twenty-nine miles at 15 kWh per mile is 435 kWh.
- The train has a kinetic energy of 94.9 kWh at 125 mph and twenty percent will be lost in stopping at Leicester, which is 19 kWh.
This means that a battery of at least 454 kWh will be needed to propel the train to Leicester.
Kettering To Sheffield
If the train went all the way without stopping between Kettering and Sheffield, the energy used would be much higher.
One hundred-and-one miles at 15 kWh is 1515 kWh.
So given that the train will be slowing and accelerating, we’re probably talking of a battery capacity of around 2000 kWh.
In our five-car example train, this is 400 kWh per car.
Kettering To Sheffield With Stops
The previous calculation shows what can be achieved, but we need a practical train service.
When I last went to Sheffield, the train stopped at Leicester, Loughborough, East Midlands Parkway, Long Eaton, Derby and Chesterfield.
I have built an Excel spreadsheet, that models this route and it shows that if the train has a battery capacity of 2,000 kWh, the train will get to Sheffield with 371 kWh left in the battery.
- Increase the efficiency of the regenerative braking and the energy left is 425 kWh.
- Reduce the train’s energy consumption to 12 kWh per mile and the energy left is 674 kWh.
- Do both and the energy left is 728 kWh.
The message is clear; train manufacturers and their suppliers should use all efforts to improve the efficiencies of trains and all of their components.
- Aerodynamics
- \Weight savings
- Bogie dynamics
- Traction motors
- Battery capacity and energy density
- Low energy lighting and air-conditioning
No idea however wacky should be discarded.
Network Rail also has a part to play.
- The track should have as a high a line speed as is practical.
- Signalling and timetabling should be designed to minimise interactions with other services.
Adding all these together, I believe that in a few years, we could see a train, that will consume 10 kWh per mile and have a regenerative braking efficiency of ninety-five percent.
If this can be achieved then the train will have 960 kWh in the batteries when it arrives in Sheffield.
Sheffield To Kettering
There is no helpful stretch of electrification at the Sheffield end of the route, so I will assume that there is a method of charging the batteries at Sheffield.
Unsurprisingly, as the train is running the same total distance and making the same number of stops, if the train starts with a full battery at Sheffield, it arrives at Kettering with the same amount of energy in the battery, as on the Northbound-run to Sheffield.
An Interim Conclusion
I am led to the interim conclusion, that given the continued upward curve of technology and engineering, that it will be possible to run 125 mph electric trains with an appropriately-sized battery.
How Much Battery Capacity Can Be Installed In A Train?
In Issue 864 of Rail Magazine, there is an article entitled Scotland High Among Vivarail’s Targets for Class 230 D-Trains, where this is said.
Vivarail’s two-car battery units contains four 100 kWh lithium-ion battery rafts, each weighing 1.2 tonnes.
Consider.
- Vivarail’s cars are 18.37 metres long.
- Car length in a typical Aventra, like a Class 720 train, is 24 metres.
- Aventras have been designed for batteries and supercapacitors, whereas the D78 trains, used as a base for the Class 230 train,were not.
- Batteries and supercapacitors are getting better all the time.
- Batteries and supercapacitors can probably be built to fit in unusually-shaped spaces.
I wouldn’t be surprised to see Aventras being able to take double the capacity of a Class 230 train under each car.
I wouldn’t rule out 2,000 kWh energy storage capacity on a five-car train, that was designed for batteries.
The actual size installed would depend on operator, weight, performance and cost.
My Excel spreadsheet shows that for reliable operation between Kettering and Sheffield, a battery of at least 1200 kWh is needed, with a very efficient train.
Charging Trains En-Route
I covered en-route charging fully in Charging Battery/Electric Trains En-Route.
I came to this conclusion.
I believe it is possible to design a charging system using proven third-rail technology and batteries or supercapacitors to transfer at least 200 kWh into a train’s batteries at each stop.
This means that a substantial top up can be given to the train’s batteries at stations equipped with a fast charging system.
An Astonishing Set Of Results
I use astonishing lightly, but I am very surprised.
I assumed the following.
- The train uses 15 kWh per mile to maintain the required line speed and power the train’s systems.
- Regenerative braking is eighty percent efficient.
- The train is fitted with 600 kWh of energy storage.
- At each of the six stations up to 200 kWh of energy can be transferred to the train.
Going North the train arrives in Sheffield with 171 kWh in the energy storage.
Going South the train arrives at Kettering with 61 kWh in the energy storage.
Probably a bit tight for safety, but surprising nevertheless.
I then tried with the following.
- The train uses 12 kWh per mile to maintain the required line speed and power the train’s systems.
- Regenerative braking is ninety percent efficient.
- The train is fitted with 500 kWh of energy storage.
- At each of the six stations up to 200 kWh of energy can be transferred to the train.
Going North the train arrives in Sheffield with 258 kWh in the energy storage.
Going South the train arrives at Kettering with 114 kWh in the energy storage.
It would appear that increasing the efficiency of the train gives a lot of the improvement.
Finally, I put everything, at what I feel are the most efficient settings.
- The train uses 10 kWh per mile to maintain the required line speed and power the train’s systems.
- Regenerative braking is ninety-five percent efficient.
- The train is fitted with 500 kWh of energy storage.
- At each of the six stations up to 200 kWh of energy can be transferred to the train.
Going North the train arrives in Sheffield with 325 kWh in the energy storage.
Going South the train arrives at Kettering with 210 kWh in the energy storage.
These sets of figures prove to me, that it is possible to design a 125 mph battery/electric hybrid train and a set of charging stations, that will make St. Pancras to Sheffield by electric train, a viable possibility without any more electrification.
Should The Train Be Fitted With A Means Of Charging The Batteries?
Why not?
Wires do go down and rest assured, a couple of battery/electric hybrids would get stuck!
So a small diesel or hydrogen generator to allow a train to limp a few miles might not be a bad idea.
Electrification Between Sheffield And Clay Cross On The Midland Main Line
In The UK’s New High Speed Line Being Built By Stealth, there is a sub-section with the same title as this sub-section.
This is the first part of that sub-section.
This article on Rail Technology Magazine is entitled Grayling Asks HS2 To Prepare For Electrification Of 25km Midland Main Line Route.
If this electrification happens on the Midland Main Line between Sheffield and Clay Cross, it will be another project in turning the line into a high speed route with a 200 kph operating speed, between London and Sheffield.
Currently, the electrified section of the line South of Bedford is being upgraded and the electrification and quadruple tracks are being extended to Glendon Junction, where the branch to Corby leaves the main line.
The proposed electrification will probably involve the following.
- Upgrading the line to a higher speed of perhaps 225 kph, with provision to increase the speed of the line further.
- Rebuilding of Chesterfield station in readiness for High Speed Two.
- Full electrification between Sheffield and Clay Cross.
Clay Cross is significant, as it is where the Midland Main Line splits into two Southbound routes.
- The main route through the Derwent Valley Mills World Heritage Site and Derby station.
- The secondary route of the Erewash Valley Line to the East Midlands Hub station.
Note.
- Some of the tunnel portals in the Derwent Valley are Listed.
- Trying to electrify the line through the World Heritage Site will be a legal and engineering nightmare.
- Network Rail has spent or is spending £250million on upgrading the Erewash Valley Line.
- High Speed Two will reach The East Midlands Hub station in 2032.
When High Speed Two, is extended North from the East Midlands Hub station, it will take a route roughly following the M1. A spur will link High Speed Two to the Erewash Valley line in the Clay Cross area, to enable services to Chesterfield and Sheffield.
But until High Speed Two is built North of the East Midlands Hub station, the Erewash Valley Line looks from my helicopter to be capable of supporting 200 kph services.
If this electrification is performed, it will transform the prospects for battery/electric hybrid trains between London and Sheffield.
- Trains will have to run fifteen miles less on battery power.
- Trains will arrive in both St. Pancras and Sheffield with batteries that are at least three-quarters full.
- Returning the trains will fill them up on the electrification at the end of the line.
- There will probably not be a need for charging systems at St. Pancras, Chesterfield and Sheffield.
I also think, that as the train could arrive in Sheffield with a full battery, there is the possibility of extending services past Sheffield to Barnsley, Huddersfield and cLeeds, if the operator felt it was a worthwhile service.
Nottingham
Nottingham is just eight miles from East Midlands Parkway station, which is less distance than Derby.
So if the battery/electric hybrid trains can reach Derby from Kettering on Battery power, with some help from charging at Leicester and Loughborough, the trains can reach Nottingham, where charging would be installed.
Conclusion
From my calculations, I’m sure that an efficient battery/electric hybrid train can handle all current services on the Midland Main Line, with third-rail charging at intermediate stations.
I do think though, that if Sheffield to Clay Cross Junction is electrified in preparation for High Speed Two, that it makes the design easier and the economics a lot better.
It would also give Sheffield a genuine sub-two hour service to London, which would only get better.
Bombardier’s 125 Mph Electric Train With Batteries
In Bombardier Bi-Mode Aventra To Feature Battery Power, I said this.
The title of this post is the same as this article in Rail Magazine.
A few points from the article.
- Development has already started.
- Battery power could be used for Last-Mile applications.
- The bi-mode would have a maximum speed of 125 mph under both electric and diesel power.
- The trains will be built at Derby.
- Bombardier’s spokesman said that the ambience will be better, than other bi-modes.
- Export of trains is a possibility.
Bombardier’s spokesman also said, that they have offered the train to three new franchises. East Midlands, West Coast Partnership and CrossCountry.
It has struck me, that for some applications, that the diesel engines are superfluous.
In the July 2018 Edition of Modern Railways, in an article entitled Bi-Mode Aventra Details Revealed.
In a report of an interview with Bombardier’s Des McKeon, this is said.
Conversion to pure electric operation is also a key design feature, with the ability to remove the diesel engines and fuel tanks at a later date.
So why not swap the diesel engines and add an equal weight of extra batteries?
Batteries would have the following uses.
Handling Energy Generated By Regenerative Braking
Batteries would certainly be handling the regenerative braking.
This would give efficiency savings in the use of electricity.
The total battery power of the train, would have to be large enough to handle all the electricity generated by the regenerative braking.
In the Mathematics Of A Bi-Mode Aventra With Batteries, I calculated the kinetic energy of the train.
I’ll repeat the calculation and assume the following for a pure electric train.
- The train is five cars, with say four motored cars.
- The empty train weighs close to 180 tonnes.
- There are 430 passengers, with an average weight of 90 Kg each, with baggage, bikes and buggies.
- This gives a total train weight of 218.7 tonnes.
- The train is travelling at 200 kph or 125 mph.
These figures mean that the kinetic energy of the train is 94.8 kWh. This was calculated using Omni’s Kinetic Energy Calculator.
My preferred battery arrangement would be to put a battery in each motored car of the train, to reduce electrical loses and distribute the weight. Let’s assume four of the five cars have a New Routemaster-sized battery of 55 kWh.
So the total onboard storage of the train could easily be around 200 kWh, which should be more than enough to accommodate the energy generated , when braking from full speed..
Traction And Hotel Power
Battery power would also be available to move the train and provide hotel power, when there is no electrification.
In an article in the October 2017 Edition of Modern Railways, which is entitled Celling England By The Pound, Ian Walmsley says this in relation to trains running on the Uckfield Branch, which is not very challenging.
A modern EMU needs between 3 and 5 kWh per vehicle mile for this sort of service.
As the Aventra is probably one of the most modern of electric multiple units, I suspect that an Aventra will be at the lower end of this range.
An Intelligent Computer
The train’s well-programmed computer would do the following.
- Choose whether to use electrification or battery power to power the train.
- Decide when the battery could be charged, when electrification power was being used.
- Arrange, that when a train stopped at a station without electrification, the batteries were as full as possible.
- Manage power load, by shutting off or switching equipment to a low energy mode, when the train was running on batteries.
- Raise and lower the pantograph as required.
The computer could take account of factors such as.
- Passenger load and total weight.
- Route and train’s position.
- Weather.
- Future signals.
The computer would only be doing a similar job that is done by those in the flight control systems of aircraft.
Although, trains run in less dimensions and don’t need to be steered.
How Far Would This Train Go On Batteries?
This is question of the same nature as how long is a piece of string?
It depends on the following.
- The severity of the route.
- The size of the batteries.
- The load on the train.
- The number of stops.
- Any delays from slow-moving trains.
- The timetable to be used.
I would expect that train manufacturers and operating companies will have a sophisticated mathematical model of the train and the route, that can be run through various scenarios.
With modern computers you could do a Monte-Carlo simulation, trying out millions of combinations, which would give a very accurate value for the battery size to have a near hundred percent chance of being able to run the route to the timetable.
After all if you ran out of power with a battery train, you stop and the train has to be rescued.
Suppose you were going to run your 125 mph Electric Train With Batteries from Kings Cross to Middlesbrough.
- You would need a battery range of about fifty miles, to go between Northallerton and Middlesbrough stations and come back.
- You would also need to have enough power to provide hotel power in Middlesbrough station, whilst the train was turning back.
Certain things could be arranged so that the service runs smoothly.
- The train must leave the East Coast Main Line with a fully-charged battery.
- The train must leave the East Coast Main Line as fast as possible.
- The train should have a minimum dwell time at all the intermediate stops.
- The train could be driven very precisely to minimise energy use.
Some form of charging system could also be provided at Middlesbrough. Although it could be difficult as there are only two platforms and trains seem to turn round in a very short time of six minutes
Electrification could also be extended for two hundred metres or so, at Northallerton junction to ensure points 1 and 2 were met.
Effectively, trains would be catapulted at maximum energy towards Middlesbrough.
Points 3 and 4 require good signalling, a good Driver Advisory System and above all good driving and operation.
What Other Routes Could Use 125 mph Electric Trains With Batteries?
Use your imagination!