locomotive rigid wheel base

例句：

1. 1. The engineers are responsible for the operation of the locomotives.
   工程师负责操作机车。
2. 2. The train was so loud that it drowned out the sound of the locomotives.
   火车的声音太响了，以至于淹没了机车的声音。
3. 3. The locomotives were designed to be more efficient and reliable than their predecessors.
   这些机车的设计比它们的前辈更高效、更可靠。