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

Typically that's an indicator to,
you know, check your ENGINE.
The Big Bang Theory Season 2, Episode 5

It's the stupid ENGINE
that stopped working.
The Big Bang Theory Season 2, Episode 14

the conductor said if I come
back to the ENGINE room,
The Big Bang Theory Season 7, Episode 15

from the ENGINE
to the last axle.
Westworld Season 2, Episode 5