[FatherofFive]

How many people were on the train to begin with?

I suggest the correct answer is 0, unless some people live on the train.

[AndyTheBear]

Yeah I also wondered if it was a trick question in the sense they do some ad hoc pedantic interpretation of the words. Because taking it at face value its so easy that I wondered how people could missed it. But alas its just a super easy problem.

[dforest]

That was my answer.