I'm enthralled by railroads in general, but I especially enjoy the context. Locomotives are OK, but I'm not one of those railroad enthusiasts who's only interested in photographing the engines at the head of a train. I really like railroad structures and physical plant of all kindsbridges, signals, trackworkand I especially appreciate small town combination depots (that serve both passengers and freight). They represent American communities before the automobile complex altered land use patterns and the way we interact with each other. For a harangue on America's socially disastrous choices regarding land use and transportation, I have more discussion and links.
You can join the Railroad Station Historical Society by contacting the Business Manager: Jim Dent, 33 Third Ave., Hawthorne, NJ 07506, email@example.com. They have a bimonthly newsletter and an annual conference that involves visiting historic depots in the vicinity of the conference city. Recent conferences have been held in San Antonio, TX; Raleigh, NC; Rochester, NY; Elkhart, IN; Newark, NJ; Dayton, OH; Fort Worth, TX. The next one, in June 2003, will be in Portland, ME.
I also have a page linking to some images of railroad depots that haven't survived.