this post was submitted on 20 Jul 2023
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No generally you can get really good efficiency out of doing that. Lost of rail locomotives do that and are pretty efficient.
Those are generally diesels running at a constant RPM.
Electric trains work for a few reasons, multiple cars can be driven without giving up cargo space, the amount of power put down can be much higher, and wheel slippage can be managed almost instantaneously. These gains allow electric trains to overcome the loss due to electric generation and storage.