locomotive

例句：

1. 1.The engineer was responsible for the safe operation of the locomotives.
   工程师负责确保火车头的安全可靠运行。
2. 2. The locomotives were designed to be environmentally friendly.
   这些火车头被设计成环保的。
3. 3.The locomotives were used to transport goods across long distances.
   这些火车头被用来在长距离内运输货物。