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?
The Big Bang Theory Season 7, Episode 15
I hear LOCOMOTIVE smoke
is the second leading cause...
The Big Bang Theory Season 8, Episode 22
and I get to operate an actual LOCOMOTIVE.
The Big Bang Theory Season 10, Episode 15