With this type of technology, Turbos were practical with low fuel prices. They are inefficient when run at part load. The genset concept can restore some efficiency, but that adds complications.
The main problem, IIRC, is where to run it. The only railroad in the US willing to let trains run as fast as the JetTrain needs to in order to be practical is Amtrak, on the NEC.
It's an Acela power car with a jet-engine derivative gas turbine engine. Like all gas turbines, it has two effective fuel efficiency settings ... shut-down or wide-open full bore.
Why has the Bombardier Jet Train not been put into commercial use? They would be perfect for Amtrak's Cascade route pulling the Talgo's.
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