![](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
"You are running the LOCOMOTIVE."
(GASPS)
The Big Bang Theory Season 10, Episode 15
![If you knocked I couldn't hear you.
I'm welding this locomotive engine.
If you knocked I couldn't hear you.
I'm welding this locomotive engine.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
If you knocked I couldn't hear you.
I'm welding this LOCOMOTIVE engine.
The Big Bang Theory Season 10, Episode 15
![U.S. locomotive
ever built?
U.S. locomotive
ever built?](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
U.S. LOCOMOTIVE
ever built?
The Big Bang Theory Season 7, Episode 15
![I bought an N-gauge locomotive.
I bought an N-gauge locomotive.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
I bought an N-gauge LOCOMOTIVE.
The Big Bang Theory Season 5, Episode 3