The MKT, the Missouri Kansas Texas, is known to all as the Katy.

Archaic slow railroad joke: A female passenger riding on the Ghan, the train from Adelaide to Alice Springs, frantically gets the conductor's attention when a delay is announced.
"How long is the delay? I have to get to Alice Springs right away. I am about to have a baby."
"Madam, you should never have gotten on this train if you were in that condition!"
"When I got on the train I wasn't in this condition."
- Phil