Turbine-electric powertrain

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A turbine–electric transmission system includes a turboshaft gas turbine connected to an electrical generator, creating electricity that powers electric traction motors. No clutch is required.

ALCO-General Electric Union Pacific GTELs gas turbine–electric locomotive. X-18 is one of the third series, built 1958–61.
Turbotrains were gas turbine trains built in France 1971–75 and supplied to SNCF, Amtrak and Iranian Railways.

Turbine–electric transmissions are used to drive both gas turbine locomotives (rarely) and warships.

A handful of experimental locomotives from the 1930s and 1940s used gas turbines as prime movers. These turbines were based on stationary practice, with single large reverse-flow combustors, heat exchangers and using low-cost heavy oil bunker fuel. In the 1960s the idea re-emerged, using developments in light weight engines developed for helicopters and using lighter kerosene fuels. As these turbines were compact and lightweight, the vehicles were produced as railcars rather than separate locomotives.