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gas turbine locomotive
:''This article is about gas turbine locomotives with mechanical transmission''
A Gas turbine locomotive is a locomotive powered by a gas turbine. The majority of gas turbine locomotives have had electric transmission but mechanical transmission has also been used, particularly in the early days. The advantage of using gas turbines is that they have very high power-to-bulk and power-to-weight ratios. The disadvantage is that gas turbines generally have lower thermal efficiency than diesel engines, especially when running at less than full load.
==Overview==
Where electric transmission is used, the engine is usually a single-shaft machine in which one turbine drives both the compressor and the output shaft.
With mechanical transmission, the power turbine must be capable of starting from rest, so a more complex arrangement is necessary. One option is a two-shaft machine, with separate turbines to drive the compressor and the output shaft. Another is to use a separate gas generator, which may be of either rotary or piston type.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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