在火车上用on。
on the train 在火车上;火车上;在火車上
例句
A ticket inspector got on the train.
查票员上了火车。
I had my pocket picked on the train.
我在火车上被扒了。
I had a doze on the train.
我在火车上打了个盹儿。
You\'re old enough to travel on the train by yourself
你长大了，能一个人坐火车了。
There was only one seat free on the train
列车上只剩下一个空座。
