diesel underground locomotive

例句：

1. 1.The diesel locomotive is the main source of power for many trains.
   柴油机车是许多火车的主要动力来源。
2. 2.The diesel engine is more efficient than gasoline engines.
   柴油发动机比汽油发动机更高效。
3. 3. The diesel locomotive was used to transport goods across long distances.
   柴油机车被用来运输长途货物。