Why should you make reservation for a train trip?

乘火车旅行为什么要预订座位呢？

May: You must be tired after the long train trip.

梅：经过长途旅行之后，你肯定很累了。

Then they took a long train trip to western China.

然后他们坐长途火车开始中国的西部之旅。

Question Title: Is train trip popular in the U. S.?

问题标题：乘坐火车旅行在美国流行吗？

If you have the time, I would suggest the train trip.

如果你有时间的话，我建议你乘火车去。