The steam locomotives were superseded by diesel units.

蒸汽机车已被柴油内燃机车所取代.

Two locomotives were drawing a train.

两个机车拖着一列火车。

Modern locomotives are generally internal combustion engines or electrical engines.

现代火车头一般是内燃机车或电气机车.

B:You can visit Shenyang Steam Locomotives Museum.

B：您可以去沈阳机车博物馆。

That old engine is the archetype of modern locomotives.

那台老式发动机是近代机车的原形.

Past three steam locomotives using outboard engines;

三则过去的蒸汽机车是采用外燃机；

DF4D diesel locomotive, one of the most common locomotives for trains with passengers.

DF4D内燃机车，最常见的牵引客车的机车之一。

The steam locomotives on this line are now out of service.

这条铁路线上的蒸汽机车现在已停止使用.

Locomotives and diesel trucks and ship engines run on a heavy grade of fuel.

机车、柴油载重车和船用发动机靠烧重油运行.

But locomotives are increasingly recognized as a significant source of pollution.

柴油机车被越来越多的人认为是主要的污染源.