signalman

详细解释:n. 信号手

英语解释：

名词 signalman:

a railroad employee in charge of signals and point in a railroad yard

例句：

The signalman left his cabin before attending to his signals and so committed a grave breach of duty.信号员没有发完信号就离开了他的小木房，因此犯了严重的玩忽职守的错误。