Come on into the MASSIVE Railroad Pictures Archive for, well, pictures of railroads. Over 3 million photos (!), over 100k locomotive pictures. Browse by railroad (defunct railroads are under Fallen Flags!), or browse by location, or look at rolling stock (over 700k pictures!). Looking for a way in? Check out the Editor Picks and Contributor Picks pages.
Trains of Russia, photos from Pavoroz.com, a site about the railways of Russia, the Baltics and the C.I.S. (Commonwealth of Independent States). More than 50 000 pictures of steam, diesel, and electric locomotives, EMU and DMU trains, draisines, stations, tracks, etc. The collection is updated daily. The Turkestan-Siberian railway. [more inside]
The Narrow Gauge Circle hosts, among other fine features, the Ted Kierscey Collection -- page after page after page of historical photographs of Colorado's railroad and mining towns.
Tim Davis: images from the sides of boxcars, coal cars, miscellaneous freight cars and a caboose. .