
A brain-damaged choo-choo TRAIN?
The Big Bang Theory Season 1, Episode 6

...which TRAIN should I get on?
The Big Bang Theory Season 8, Episode 21

in the TRAIN depot!
Westworld Season 2, Episode 7

I've been on that TRAIN.
The Big Bang Theory Season 7, Episode 15

on the day of
the TRAIN store sale.
The Big Bang Theory Season 11, Episode 12