An Alcoa FA-4 diesel LOCOMOTIVE
The Big Bang Theory Season 7, Episode 15
I bought an N-gauge LOCOMOTIVE.
The Big Bang Theory Season 5, Episode 3
"You are running the LOCOMOTIVE."
(GASPS)
The Big Bang Theory Season 10, Episode 15
So often, on the front of the LOCOMOTIVE...
The Big Bang Theory Season 8, Episode 21
U.S. LOCOMOTIVE
ever built?
The Big Bang Theory Season 7, Episode 15