Railway Prototype Cyclopedia
High quality publication devoted to railroad equipment. Passenger trucks covered in Vols 6 and 11, maybe in other volumes as well.
Pullman car list-HW & LW
Tom Madden's extensive list of 1000's of prototype HW & LW sleeping cars, including truck and mechanical info.
Passenger Truck List, HO gauge
John Fiscella's extensive listing of trucks manufactured for HO passenger cars in HO gauge, in .PDF format.
ScaleModel.net--International listing
The goal of this site is to keep and maintain an international based list of all the web sites which are truly related to Scale Models.