Pickins are slim, but this is probably the most compelling read:
http://www.amazon.com/exec/obidos/tg/detail/-/031217182X
His earlier "Supertrains!" was also good.
These guys do some interesting work:
like this:
http://www.amazon.com/exec/obidos/tg/detail/-/0971817510
this could be interesting, buti haven't read it:
http://www.amazon.com/exec/obidos/tg/detail/-/0813122112