
So often, on the front of the LOCOMOTIVE...
The Big Bang Theory Season 8, Episode 21

"You are running the LOCOMOTIVE."
(GASPS)
The Big Bang Theory Season 10, Episode 15

and I get to operate an actual LOCOMOTIVE.
The Big Bang Theory Season 10, Episode 15

I hear LOCOMOTIVE smoke
is the second leading cause...
The Big Bang Theory Season 8, Episode 22

If you knocked I couldn't hear you.
I'm welding this LOCOMOTIVE engine.
The Big Bang Theory Season 10, Episode 15