转辙机

例句：

1. 1. The train needs to change its direction at the next switch.
   火车需要在下一个转辙机改变方向。
2. 2. The engineer had to make a quick decision about which switch to use.
   工程师必须迅速决定使用哪个转辙机。
3. 3. The train was delayed due to the switch not working properly.
   由于转辙机工作不正常，火车延误了。