I bought an N-gauge LOCOMOTIVE.
The Big Bang Theory Season 5, Episode 3
If you knocked I couldn't hear you.
I'm welding this LOCOMOTIVE engine.
The Big Bang Theory Season 10, Episode 15
"You are running the LOCOMOTIVE."
(GASPS)
The Big Bang Theory Season 10, Episode 15
U.S. LOCOMOTIVE
ever built?
The Big Bang Theory Season 7, Episode 15