
If you listen carefully when
the LOCOMOTIVE disconnects,
The Big Bang Theory Season 7, Episode 15

If you knocked I couldn't hear you.
I'm welding this LOCOMOTIVE engine.
The Big Bang Theory Season 10, Episode 15

I bought an N-gauge LOCOMOTIVE.
The Big Bang Theory Season 5, Episode 3

An Alcoa FA-4 diesel LOCOMOTIVE
The Big Bang Theory Season 7, Episode 15

and I get to operate an actual LOCOMOTIVE.
The Big Bang Theory Season 10, Episode 15