Australian Rail Track Corporation  
   The Australian Rail Track Corporation Ltd currently has responsibility for the management of 4430 route kilometres of standard gauge interstate track, mainly in South Australia, Victoria and Western Australia.
   http://www.artc.com.au/

Network Rail  
   Authority responsible for the United Kingdom's railway network. Information and news about the network.
   http://www.networkrail.com/

Project PARTNER - Path Allocation Re-engineering of Timetable Network for European Railways  
   EU project to develop transparent access to railway infrastructure in Europe. PARTNER is coordinated by the Institute of Transport Research (DLR) in Berlin.
   http://www.rail-partner.org

AlpTransit Gotthard AG, Luzern (Switzerland)  
   Constructing the longest railway tunnel in the world, through the base of the Alps between Switzerland and Italy. Information and history of the current and new Gotthard tunnels.
   http://www.alptransit.ch/

Rail Vikas Nigam Ltd  
   Indian Railway company, providing high speed Rail connectivity infrastructure among metro cities of Delhi-Mumbai-Chennai and Kolkata.
   http://www.rvnl.org/