
In 1944, the Pacific Railroad
built number 6131,
The Big Bang Theory Season 7, Episode 15

I'm gonna be working on the RAILROAD
all the livelong day.
The Big Bang Theory Season 10, Episode 15

You'd have to drive a RAILROAD spike into
his brain for me to beat him at checkers.
The Big Bang Theory Season 2, Episode 11

There are dozens of RAILROAD crossings
you have to blow the whistle for.
The Big Bang Theory Season 10, Episode 15

...a hot dog stand in a different
converted RAILROAD dining car.
The Big Bang Theory Season 4, Episode 6