![If you listen carefully when
the locomotive disconnects,
If you listen carefully when
the locomotive disconnects,](https://content2.mcqstudy.com/ss/tbbt-7-15-00:06:37.682.jpeg)
If you listen carefully when
the LOCOMOTIVE disconnects,
The Big Bang Theory Season 7, Episode 15
![An Alcoa FA-4 diesel locomotive
An Alcoa FA-4 diesel locomotive](https://content2.mcqstudy.com/ss/tbbt-7-15-00:01:45.171.jpeg)
An Alcoa FA-4 diesel LOCOMOTIVE
The Big Bang Theory Season 7, Episode 15
![U.S. locomotive
ever built?
U.S. locomotive
ever built?](https://content2.mcqstudy.com/ss/tbbt-7-15-00:10:42.295.jpeg)
U.S. LOCOMOTIVE
ever built?
The Big Bang Theory Season 7, Episode 15
![](https://content2.mcqstudy.com/ss/tbbt-10-15-00:02:54.425.jpeg)
"You are running the LOCOMOTIVE."
(GASPS)
The Big Bang Theory Season 10, Episode 15