Just some of the sites I visit:

Bve Home (Japan, in Japanese)

Verns Rail Pages (UK, Rail Simulation)

Cotrainz (UK, Rail Simulation)

Scottish Rail Sim Site

Mark Judd's Black 5 Steam Loco Simulator

NSW Railways (unofficial site, pictures and line data)

Australian Rail Videos

RailPage Australia

Australian Railways Historical Society (books & videos)

Alta Vista language translation site