(of arrangements) well organized or in progress
（安排）妥当，周密；在进行中
an investigation is in train.
调查正在进行中。
following behind someone or something
跟随（某人，某事）；随后
the way in which someone reaches a conclusion; a line of reasoning
思路；推理过程
I failed to follow his train of thought.
我没能跟上他的思路。