10-04-2011, 05:04 AM
sekker wrote:
davester, the enter railroad and conventional submarine fleets are diesel electrics.
You can run the gas/diesel engines at max efficiency 100% of the time.
Those are actually quite different applications. Note that those vehicles generally do not charge batteries with the diesel. It can be quite efficient to run an electric motor using a diesel generator, but it is quite another matter to charge a battery using a diesel generator.
Diesel electric submarines charge their batteries with the diesel not for efficiency, but because they have no other choice since they can't run the diesel below periscope depth. Diesel electric trains generate electricity for direct use in powering the motors. They don't charge batteries (which results in substantial losses) except for peripheral use and they use electric motors because the sufficiently lightweight gearbox needed to distribute the power needed to move such a large vehicle hasn't been invented yet.