Technology Behind Siemens Mobility’s British Battery Trains Hits The Tracks
This title of this post is the same as that of this news item from Siemens, which was published in December 2024.
These three bullet points introduce the news item.
- The Mireo Plus B battery train is rolled out in the East Brandenburg network, Germany, using the same technology as the British Desiro Verve project.
- The Desiro Verve would save £3.5 billion and 12 million tonnes in CO2 emissions for Britain’s railways over 35 years.
- The development marks the latest step of this technology’s journey to Britain’s railways.
No-one, including me, seemed to have spotted this news item, especially, since it is significant to both the UK and Germany.
But then parts of Siemens’s home country; Germany and Yorkshire, where they are building, a train factory to build London’s new Piccadilly Line trains have something big in common – There is a distinct shortage of electric trains and the overhead wires to power them.
So did German engineers, egged on by pints of British real ale, realise that their battery-electric technology for the Mireo Plus B battery-electric train, would turn a Desiro City multiple unit, like the Class 700, 707 or 717 into battery-electric trains.
These are three paragraphs from the Siemens news item.
The innovative technology behind Siemens Mobility’s British battery trains has been rolled out in the East Brandenburg network in Germany.
31 of the company’s Mireo Plus B trains are being phased in to the Berlin Brandenburg metropolitan region, beginning on Sunday (15 December) and is the latest proof point of the technology that underpins the Desiro Verve project in Britain. This follows the debut of this technology on 27 new trains in the Ortenau region of Germany in April, with more set to arrive in Denmark in 2025.
The British Desiro Verve trains would be assembled at Siemens Mobility’s new Train Manufacturing Facility in Goole, East Riding of Yorkshire, formally opened by the Transport Secretary and Mayor of London in October.
I’d always wondered, what Siemens would do with this factory, when it had finished making the Piccadilly Line trains.
It also should be noted, that the boss of Siemens UK, when the Goole factory was planned was Jürgen Maier, who according to his Wikipedia entry has Austrian, British and German citizenship and is now the boss of Great British Energy.
I believe that Siemens have big plans for the Goole factory.
One thing it has, that at the present time could be a problem in Germany, is large amounts of renewable electricity and hydrogen, so will energy-intensive components for trains be made at Goole?
It will be interesting to see how the Goole factory develops.
The Desiro Verve Train For The UK and Ireland
In the Siemens news item, their Joint CEO for the UK and Ireland; Sambit Banerjee, says this.
The Desiro Verve would be assembled at our state-of-the-art Goole Rail Village in Yorkshire and offers an integrated solution to replace Britain’s aging diesel trains without having to electrify hundreds of miles of track, saving the country £3.5 billion over 35 years and providing a practical path to decarbonising British railways.”
In June, Siemens Mobility identified how the Desiro Verve could save Britain’s railways £3.5 billion over 35 years compared with using diesel-battery-electric ‘tri-mode’ trains. This would support the Government’s aim of removing diesel-only trains from Britain’s railways by 2040.
The British trains would be powered by overhead wires on already electrified routes, then switch to battery power where there are no wires. That means only small sections of the routes and/or particular stations have to be electrified with overhead line equipment (OLE), making it much quicker and less disruptive to replace diesel trains compared to full electrification.
I agree with his philosophy.
The Rail Charging Converter
When I wrote Cameron Bridge Station – 15th May 2025, I described how a short length of overhead electrification could be erected at the station to charge passing trains, using their pantographs.
Cameron Bridge station is lucky in that there is already a 132,000 KVAC electricity connection to the distillery next door.
But at other places, where there is no connection, you could wait as long as seven years to be connected to the grid.
So Siemens have come up with the Rail Charging Converter, that provides a local electricity supply to support the charger.
It is described in this paragraph from the news item.
This OLE can also be installed much more quickly using Siemens Mobility’s innovative Rail Charging Converter (RCC), which makes it possible to plug directly into the domestic grid – potentially cutting delivery times for OLE from seven years to as little as 18 months.
This Siemens visualisation shows a Verve train and an RCC.
This arrangement could be used in sensitive countryside or close to historic buildings.
Modern Railways – June 2025
There is an article about the Siemens technology in the June 2025 Edition of Modern Railways.
It is called The Battery Revolution Starts In Long Marston for which this is part of the sub-heading.
New technology being installed by Siemens Mobility at Porterbrook’s test facility paves the way for widespread use of battery trains in the UK.
The article is a must-read.
Conclusion
Siemens appear to have the technology with their Rail Charging Converter and battery-electric trains like the Verve and the Mireo Plus B, to be able to decarbonise lines without electrification all over the world.
Would larger gauge trains be delivered from Germany and smaller gauge ones from Goole?
I wouldn’t be surprised that a version for a German S-Bahn could share more characteristics, with a small British train, than a large German one.
I can also see an underground railway, that was built without power in the tunnels. So if you were building the Waterloo and City Line today, would it be battery-electric and charged at each end of the line using a pantograph?
Smart Train Lease Aims ‘To Make Renting Trains As Easy And Simple As Renting A Car’
The title of this post, is the same as that of this article on Railway Gazette International.
These four paragraphs outline the scheme.
Siemens Mobility has established a leasing subsidiary that would enable train operators to use its Mireo Smart battery, hydrogen and electric multiple-units without needing to make long-term investment commitments.
Smart Train Lease GmbH would make available at short notice multiple-units already approved for operation. These could be short or medium-term leases, with services such as maintenance available as part of the package. The aim is to provide operators with an economical way to quickly and flexibly expand their fleets and try out more sustainable traction technologies.
‘We want to make renting trains as easy and simple as renting a car, and thus help accelerate the mobility transition’, the leasing company’s CEO Benjamin Dobernecker explained on February 14.
Smart Train Lease will initially operate in Germany, although it plans to expand throughout Europe in the medium term.
I like this idea and I think it will work.
Metier Management Systems And Artemis
When four of us started Metier Management Systems in 1977 to sell our mini-computer-based project management system; Artemis, we generally rented or leased our systems, although we did sell some as the years progressed.
- For a fixed fee per month, a company got a project management computer and all the software.
- The fixed fee included installation, first line support, training and software updates.
- We could also supply extra training and project management consultancy at appropriate rates.
- The only extra costs to the client were the electricity to power the hardware and the paper to put in the printer.
- We also allowed clients to convert leases into outright sales.
This simple sales model appealed to a lot of our clients.
- The cost of the system was easy to budget.
- Many of our clients were happy with leasing or renting computer equipment.
- As the system was desk-sized, it easily fitted the average office.
But the leasing model was very advantageous to us.
- Most of our clients were large high-value quality organisations like big oil companies, nationalised industries and engineering consultancies.
- Our Finance Director and our Bank Manager at Lloyds Bank devised a plan, whereby we bundled a number of high-quality leases together and sold the bundle to Lloyds Bank’s leasing company.
The money we received gave us a healthy cash flow.
- The cash flow was then used to fund Research and Development and to finance more sales.
- If say someone like BP or Shell should phone up or send a fax, wanting a system immediately, we were generally able to fulfil their request.
I am sure that Siemens Mobility will be using a similar model.
They will aim to have trains in stock to fulfil clients needs.
So if Deutsche Bahn phone up saying have you got a three-car battery-electric train that works with 15 KVAC and has a range of 100 kilometres for next Monday, Siemens Mobility can generally say yes.
What helps is that the modular Mireo Smart multiple unit comes in battery, hydrogen and electric versions.
Extras could include full servicing a driver.
So Siemens Mobility will plug the train together and deliver it.
How Would Siemens Use The Leasing Model In Great Britain?
Consider.
- There are a lot of routes that need to be decarbonised in Great Britain.
- Many of these routes have electrification at one or both ends.
- Often these routes terminate in a bay platform.
- On most of these routes a two-, three-, four- or five-car train will be sufficient capacity.
- In the Desiro City, Siemens have a train, that is acceptable to Great Britain.
- If routes in Great Britain are to be electrified, they must be electrified with 25 KVAC overhead wires.
- Trains would be 100 mph, so they wouldn’t be limited as to routes.
- A Mireo-B has a range of between 80-100 kilometres or 49.7-74.6 miles.
I am sure Siemens Desiro City or its European equivalent; Mireo can be developed into a family of trains suitable for GB!
- The basic train would be two driving cars.
- Length would be increased by coupling trailer cars between the two driving cars.
- Hydrogen power would be in one of the trailers.
- Batteries would be under an appropriate number of cars.
Battery trains would be able to use a simple automatic charger, similar to the one, that I described in GWR Trialling Transformative Ultra-Rapid Charging Train Battery.
An Example – Mid-Cornwall Metro
This map shows the Mid-Cornwall Metro.
Consider.
- Newquay and Par is 20.8 miles.
- Falmouth Docks and Par is 30.8 miles.
- Newquay and Falmouth Docks is 51.6 miles.
- The maximum speed between Par and Newquay is around 30 mph
- The maximum speed between Par and Falmouth Docks is around 50-70 mph
- There are twelve intermediate stations.
- There is a reverse at Par station.
- Charging would be easy to install at Falmouth Docks, Newquay and Par.
- In Par Station – 10th February 2024, I suggested that Par station could be fully-electrified, so that expresses could have a Splash-and-Dash on their way to London and Penzance. If all platforms at Par were electrified the Mid-Cornwall Metro trains could charge from the electrification, as they reversed.
There are two main ways that the Mid-Cornwall Metro might operate.
- There would be chargers at Newquay and Falmouth Docks and trains would shuttle the 51.6 miles between the two stations.
- There would only be charging at Par and trains would after charging at Par go alternatively to Newquay and Falmouth Docks.
The first might need smaller batteries and the second would only need one charger.
An Example – Uckfield Branch
The Uckfield branch is in Southern England.
- It is not electrified between Hurst Green Junction and Uckfield, which is 24.7 miles.
- There are eight intermediate stations.
- The line can accommodate ten-car trains.
There is space at Uckfield station for a charger.
Charging would be at Uckfield station and North of Hurst Green Junction, where it will use the existing electrification.
Conclusions
This leasing/rental model will surely encourage train operators to replace diesels with appropriate zero-carbon alternatives on routes that need to be decarbonised.
Govia Thameslink Railway Issues a Prior Information Notice For New Trains
This article on Railway Gazette is entitled UK Railway News Round-Up and contains this section.
Govia Thameslink Railway has issued a prior information notice seeking the provision of between 21 and 30 four-car 25 kV 50 Hz 160 km/h through-gangwayed EMUs with air-conditioning and toilets for use on existing and/or additional Great Northern services from May 2024. Maintenance would be undertaken in-house at Hornsey depot, supported by a Technical Support & Spares Supply Agreement.
I find this all a bit puzzling.
- The trains that need replacing are surely the eighteen Class 313 trains, that run on the West Coastway Line, as they are some of the oldest trains on the UK network.
- If Govia Thameslink Railway were serious about decarbonisation, they would also replace the Class 171 diesel trains, that work the Marshlink Line and the Uckfield branch, with electric trains with a range of thirty miles on batteries.
How many trains would be needed to replace the Class 313 and Class 171 trains?
- The eighteen three-car Class 313 trains could be replaced with an equal number of new four-car trains and this might result in a rise in passenger numbers.
- I would assume the eighteen trains includes allowances for trains in maintenance and spare trains for when a train fails.
- It may be possible to replace the six four-car Class 171 trains used on the Marshfield Line with three new four-car trains, which have a range of thirty miles on batteries.
- The eleven two-car Class 171 trains used on the Uckfield branch could be replaced with three new four-car trains, which have a range of thirty miles on batteries and would run as four-car trains.
- If eight-car trains were needed on the Uckfield branch, there would be a need for six new four-car trains.
- If twelve-car trains were needed on the Uckfield branch, there would be a need for nine new four-car trains.
Note.
- If four-car trains are needed on the Uckfield branch, this means a total of 18+3+3 or 24 trains.
- If eight-car trains are needed on the Uckfield branch, this means a total of 18+3+6 or 27 trains.
- If twelve-car trains are needed on the Uckfield branch, this means a total of 18+3+9 or 30 trains.
Trains on these Southern routes wouldn’t be stabled at Hornsey depot, but could be moved to Hornsey for maintenance using Thameslink.
But the puzzling bit is that the prior information notice says that the trains will be.
Four-car 25 kV 50 Hz 160 km/h through-gangwayed EMUs with air-conditioning and toilets for use on existing and/or additional Great Northern services from May 2024.
Note.
- There is no mention of the trains being able to run on 750 VDC third-rail infrastructure.
- The trains will run on Great Northern services and the Class 313 and Class 171 trains run on Southern routes.
- The only Great Northern services, that have not been moved to Thameslink are Kings Cross and Cambridge, Ely and King’s Lynn and services to Moorgate.
- The Moorgate services have their own dual-voltage Class 717 trains.
- Govia Thameslink Railway have ambitions to double the frequency of trains to King’s Lynn.
- Two eight-car trains per hour (tph) between King’s Cross and King’s Lynn would need sixteen operational four-car trains.
- Two twelve-car trains per hour (tph) between King’s Cross and King’s Lynn would need twenty-four operational four-car trains.
If Govia Thameslink Railway are thinking of thirty new trains, they must have other destinations in mind.
Could we be seeing a double swap?
- An appropriate number of new trains are procured to run Great Northern services between Kings Cross and Cambridge, Ely and King’s Lynn.
- The Class 387 trains released will be moved to the South to replace the Class 313 and Class 171 trains.
- Some or all of the transferred Class 387 trains will be fitted with batteries to give a range of thirty miles without electrification.
Note.
- Could the new trains be Siemens Desiro City trains like the Class 700 and Class 717 trains, which are already maintained at Hornsey depot? It would surely be more efficient and save money.
- Class 387 trains are dual voltage and would need little or no modification to replace the Class 313 trains.
- Uckfield and Hurst Green junction is 24.7 miles.
- Ashford International and Ore is 25.4 miles
- Adding a battery to a Class 387 train has not been done, but Bombardier converted a near-identical Class 379 train to battery-electric operation over eight years ago.
- Converting a Class 387 train gives a dual-voltage battery-electric train.
- I suspect a charger would be needed at Uckfield. Could it be a short length of 25 KVAC overhead electrification?
Could all the Class 387 trains, that will replace the Class 313 and Class 171 trains be identical to ease the problems, when a train develops a fault?
Conclusion
It looks a good plan.
It also opens up the following possibilities.
- Deployment of 750 VDC battery-electric trains on other routes.
- Deployment of 25 KVAC overhead battery-electric trains on other routes.
- Deployment of tri-mode battery-electric trains on other routes.
- Charging of battery-electric trains using a short length of 25 KVAC overhead electrification.
- Fitting of batteries to Class 379 trains to create a 25 KVAC overhead battery-electric train.
It might be possible to convert other Electrostars to battery-electric operation.
Ignoring Class 387 trains on dedicated services like Heathrow and Gatwick Express, these trains are available for conversion.
- Class 379 trains – Stored – 30 trains
- Class 387 trains – Govia Thameslink Railway – 40 trains
- Class 387 trains – Great Western Railway – 33 trains
Note.
- This gives 103 trains.
- They all have good interiors.
- They are all 100/110 mph trains.
- All trains could be updated to 110 mph.
- All trains can use 25 KVAC overhead electrification.
- The Class 387 trains can also use 750 VDC third-rail electrification.
- The Class 379 trains were built in 2010-2011.
- The Class 387 trains were built from 2014.
I believe both classes will make excellent battery-electric trains.
Where will they be deployed?
These are a selection of routes starting in the South-East of England.
- Ashford International and Eastbourne.
- Gravesend and Hoo.
- London Bridge and Uckfield.
- London Paddington and Bedwyn.
- London Paddington and Oxford.
- Reading and Basingstoke.
- Reading and Gatwick.
- Reading and Redhill.
- Slough and Windsor & Eton Central.
- Twyford and Henley-on-Thames
I’ve only added routes which are less than thirty miles.
The Anonymous Widower 