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
If you listen carefully when
the LOCOMOTIVE disconnects,
The Big Bang Theory Season 7, 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