More of the... obsessive compulsive...

Trains are also a common interest of Terminators.

I must have missed that movie/episode/whatever. Unless you were just referring to the guys seeing Summer Glau taking that trip.

Summer Glau of course

In S07E15 "The Locomotive Manipulation" Sheldon, Amy, Howard and Bernadette go away for Valentine's Day on board a vintage train. Sheldon meets another train enthusiast, Eric, and he forgets all about Amy and their romantic weekend trip.

• "Valentines Day dinner on the train"