The Stadler Data Sheet For A Class 777 IPEMU
This data sheet is now available on the Stadler web site.
These are my observations.
Battery Charging
The datasheet says this about battery charging.
While an IPEMU is running on the electrified network, the batteries can be charged from the third rail, as well as through regenerative braking.
I’m glad to see the trains have regenerative braking, which in a train with frequent stops saves electricity.
Battery Charging Time
The datasheet says this about battery charging time.
IPEMUs can be recharged in less than 15 minutes.
That time compares favourably with Hitachi’s time.
Expected Battery Life
The datasheet says this about expected battery life.
The IPEMU battery can undergo more than 10,000 charge/discharge cycles, which is about four times the lifetime of a battery used in EVs.
Stadler also give the battery a minimum expected life of eight years.
Transition Between Electrification And Battery
The datasheet says this about this important transition.
Transition between electrified and non-electrified networks without interruption, reducing travel times.
Stadler certainly do the changeover from electric to diesel smoothly on a Class 755 train.
A Comparison To Tesla
This is a paragraph in the introduction of the data sheet.
The battery/vehicle weight-ratio of a Tesla is about 25 per cent, while the ratio of the IPEMU is only about 6 per cent.
I suspect the rolling resistance, is also a lot less, than the rolling resistance of a Tesla, due to the superior properties of steel wheels on rail, as opposed to rubber tyres on road.
Battery Range
The data sheet gives the following.
- Installed battery capacity – 320 KWh
- Maximum speed (IPEMU mode) – 62 mph
- Range in battery operation – 34 miles
- Maximum demonstrated range – 84 miles
Note.
- I would assume the 55 km given for range on the datasheet is a guaranteed range.
- The maximum demonstrated range is from New Merseyrail Train Runs 135km On Battery.
- All other figures are from the datasheet.
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.
I don’t think the terrain of Merseyrail’s services are much different from the Uckfield branch, so what are the figures for the Class 777 trains on battery power?
- 55 km range – 2.353 kWh per vehicle mile
- 135 km range – 0.952 kWh per vehicle mile
The train appears to be very miserly with electricity.
But if the attention to detail in the electrical system of the train is of the standard of a Swiss watch, I don’t think they are unreasonable.
Operation With 25 kV Overhead Electrification
The datasheet says nothing about this, but the Wikipedia entry for the Class 777 train says this under Design.
Because current regulatory policy makes it unlikely that future extensions of Merseyrail’s unshielded third rail traction power supply will be approved, Class 777 units will be delivered with provision for the future installation of 25 kV 50 Hz AC overhead line traction equipment.
This is probably needed for charging at locations without third-rail electrification.
A Heavy Load From Felixstowe To Manchester
As I waited for my train at Canonbury station this morning, this very long train went through.
After I got home, I found that it was going from the Port of Felixstowe to Trafford Park Freightliner Terminal.
The journey will take around nine-and-a-half hours.
- This time includes a sixty-five minute stop at Ipswich to change the diesel locomotive or locomotives used to haul the train out of the Port of Felixstowe for the pair of Class 90 electric locomotives for the rest of the journey to the North-West.
- The two locomotives together have a power output of about 7.5 MW.
- The train will pick up the West Coast Main Line at Primrose Hill and then take the Trent Valley Line between Rugby and Stafford before approaching Trafford Park, using the Castlefield Corridor through Manchester Piccadilly and Oxford Road stations.
- As I write this, the train is on time as it approaches Tamworth.
The train has done well as at Watford, it was running twenty minutes late. The train crew have used the 7.5 MW well to claw back the time.
Did it help the crew to regain the schedule, that they had 7.5 MW on hand, as opposed to the less than 3 MW from the UK’s largest diesel locomotive?
To my mind, this illustrates one of the reasons, why long distance trains are best run by powerful electric locomotives.
In Do Cummins And Stadler Have a Cunning Plan?, I describe the new Class 99 locomotive.
- It is an electro-diesel locomotive.
- It has 6 MW available on 25 KVAC overhead electrification.
- It has a 1.8 MW Cummins diesel engine, which may be powerful enough to haul the largest trains in and out of the Port of Felixstowe, where the route is not electrified.
Thirty of these locomotives have been ordered by GB Railfreight.
I believe that one of these locomotives could handle a very heavy freight train between the Port of Felixstowe and Trafford Park Freightliner Terminal.
- The locomotive working alone could handle the train on the unelectrified line between Felixstowe and Ipswich.
- There would be no need to electrify the lines in the Port of Felixstowe.
- There would be no need for a prolonged stop in Ipswich.
- An hour on the journey could be saved.
- There might be a saving in the number of crew.
The Class 99 locomotive seems to be well-designed for handling freight trains out of Felixstowe.
Were Freightliner experimenting with what they needed from an electro-diesel locomotive, when I took this picture at Shenfield?
Note.
- The Class 90 electric locomotive has 3.7 MW of power.
- The Class 66 diesel locomotive has 2.4 MW of power.
Was what I saw an affordable electro-diesel locomotive?
The Anonymous Widower 