why can’t we have diesel hybrids?
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Hybrid automobiles are kind of a funny thing. They get gas milage advantage purely from storing and reclaiming the energy used two slow down the car which is normally wasted. Gas engines are well suited to this because they can be easily started and stopped.
Diesel engines are most efficient 6 when they can be run at a single, optimum speed. This is why diesel transmissions usually have more gear ratios than gas, to keep the diesel at a given RPM.
Actually, all your train locomotives, these days are diesel/electric. The diesel engine runs an electric generator,which powers electric motors. The diesel motor gets to run at a more constant RPM and the electric motors are great because they are produce the most torq at low RPM. The electrical motors can also act like breaks. Now that battery storage has gotten cheaper, I can see trains carrying battery cars that would store this braking energy that they’re currently throwing away as heat.
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