The Anonymous Widower

Hybrid Power On The Railways

In my opinion, one of the best hybrid transmissions is that of London’s New Routemaster bus. This description of the drive-train is from Wikipedia.

The bus is a hybrid diesel-electric driven by a battery-powered electric motor, charged by a diesel fuelled generator and recovering energy during braking by regenerative braking.

It is a classic serial hybrid vehicle.

  • There is no mechanical connection between the engine and the driving wheels.
  • The diesel engine only runs, when the battery charge is low.
  • The electric motor is always powered directly from the battery.
  • The control systems for the drive-train are very simple.
  • It is very efficient, as the engine only runs when needed and regenerative braking is employed.
  • The bus can run on battery power only, for short distances.
  • The various components of the drive-train can be placed in convenient places and connected by power and control cables.

In the New Routemaster, the components are placed as follows.

  • The diesel engine is half-way up the back stairs.
  • The battery is under the front stairs.
  • The electric motor is under the floor  in front of the rear axle.

This flexibility is very useful in a large vehicle.

Hybrid transmissions are starting to be employed on the railways.

These are the applications in use or planned.

Alstom Coradia iLint

The Alstom Coradia iLint is a hydrogen-powered two-car multiple unit.

This video shows the operation of the train.

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It would appear to be a serial hybrid, where the hydrogen fuel-cell charges the battery and this drives the train through an electric motor,

I suspect most hydrogen trains will work in a similar way.

Class 321 Hydrogen Train

Some Class 321 trains are being converted to run on hydrogen. Unlike the Coradia iLint, the trains will also be able to use electricity from electrification.

MTU Hybrid PowerPacks

MTU have produced a Hybrid PowerPack, which is being retrofitted into several trains, including Class 170 trains in the UK.

Class 93 Locomotive

The recently-announced Class 93 locomotive appears to be a hybrid locomotive with a large diesel engine and about 125 kWh of batteries, that can also use electrification.

High Speed Bi-Mode Aventra

I am sure that Bombardier’s proposed High Speed Bi-Mode Aventra, which features batteries and 125 mph running under both diesel and electric power is a hybrid train.

Conclusion

Just as hybrid cars are becoming more numerous, I suspect we’ll be seeing more hybrid trains in the future.

December 22, 2018 - Posted by | Transport | , , , , , ,

1 Comment »

  1. […] In Hybrid Power On The Railways, I summarised the current state of development, with brief descriptions of the current hybrid trains and locomotives. […]

    Pingback by The Concept Of Hybrid Banking « The Anonymous Widower | December 25, 2018 | Reply


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