How is “in train” used?

In The Taking of Pelham 123 (2009), one line is: “As in "train rider"?”

Which movie is “in train” from?

The clip at the top of this page is from The Taking of Pelham 123 (2009).

Idiom

following behind sb

formal · Heard in 457 movies

in sb's train
following behind sb
In the train of the rich and famous came the journalists.

Definitions from the Oxford Advanced Learner's Dictionary, 9th edition

As in "train rider"?

Said in 8 films · #1