Hybrid Railway Engines

Guys this is new to me in many areas But I am sure you guys can help me out in understanding all these concepts

In case of Hybrid Engines there are two fuels used in the engine one is Diesel and the other fuel is Electric power fed directly from the traction lines.

But as I was talking to some Mechanical experts they said
Unless you have seperate isolation circuits which can permit us to completely seperate the engine from diesel power and electric power source. This hybrid engine will not work effectively
He also said Something like coupling has to be used. This coupling must switch between Electric power and Diesel power. Can you explain Why we must use such coupling? And what will happen if simulataneously both the power sources are used? But some countries are using the hybrid engines how do they bring about this change?


  • Ramani Aswath
    Ramani Aswath
    As far as I know Diesel Locos also run on electricity. The diesel engine is coupled to a generator whose output drives the electric motors.
    However, to reduce line transmission losses electric locos use high voltage motors to reduce current. Diesel generators are on board. Hence the motors can be of lower voltage.
  • Jeffrey Arulraj
    Jeffrey Arulraj
    Sir yeah I know That Engines generates electric power for driving the trains

    But I am of question can both direct electric power from traction lines and Diesel power can be used in the same engine

    Is this mechanism possible in a single engine? That is what puzzles me a lot.
  • Ramani Aswath
    Ramani Aswath
    If the voltage is the same or if there is a suitable voltage conditioner on board then there should be no problem

    Here is some info on a different kind of hybrid locomotives:
    Hybrid Train

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