Barry Finn earlier mentioned the Buckingham Lining-Bar Gang, and I can't second the recommendation to see them more heartily.

I was lucky enough to be playing at the same gig (Railfair '99) as they were, and saw them several times in their demonstrations... it's an education watching the work, hearing the songs... Plus, we were lucky enough to play a few songs for them during a private dinner. Very VERY wonderful people as well.

Somewhere out there they have a website which I've lost the URL for, but they have a cassette available of the basic rail calls... also a wonderful listen.

M