UKTrainSim
Central Resource for the Train Simulation community, contains a massive File Library, latest News and Reviews, Forums and Live Chat!
http://uktrainsim.com/
GWR Highworth branch line in the 1920's
Entertainment, Games, Video Games, Simulation, Trains - GWR Highworth branch line in the 1920's. History of the Swindon to Highworth branch line (being built as an MSTS route).
http://www.highworth.freeuk.com
Train Simulator Depot
Experience the power and the glory of Microsoft Train Simulator. (UK Version)
http://trainsimdepot.5u.com/
UK Branch Linez
Entertainment, Games, Video Games, Simulation, Trains - UK Branch Linez. Branch line routes add on.
http://www.magandy.net/
Yard Duty
Entertainment, Games, Video Games, Simulation, Trains - Yard Duty. Network based simulation of building and breaking up trains in prototypical yards.
http://www.yardduty.com/