Electro-diesel multiple unit

An electro-diesel multiple unit (EDMU) is a special type of train that can run on electricity or diesel fuel. It's like having two different types of fuel in the same train.

To understand how it works, let's first talk about how regular diesel trains work. Diesel trains use fuel to power an engine, which generates electricity that runs the train. This means the train needs fuel to run, and it can only go so far before it needs to stop and refuel.

Now let's talk about electric trains. Electric trains get their power from overhead wires or a third rail. These provide electricity to the train, which is used to run the train's motors. Electric trains don't produce any emissions, making them a more environmentally friendly option.

An EDMU can do both types of trains. It has an electric motor that can run on electricity from overhead wires or a third rail, just like a regular electric train. But it also has a diesel engine that can generate electricity, which the train can use to power the electric motor. This means the train can run on electric power when it's available, but it can also keep running on diesel fuel when there's no electricity available.

So, an EDMU is essentially like having two different types of train in the same vehicle, which gives it more flexibility and range.