Cut and paste job from what I know with a few additions. Hope it works.
http://www.brfares.com/ Look up fares for any train journey in Britain
http://bristol-rail.co.uk/wiki/Main_Page Bristol Railway Archive.
http://data.atoc.org/routeing-guide Rail Delivery Group Routeing Guide Data
http://iris2.rail.co.uk/tiger/ Tiger – Source of station information
http://naptan.app.dft.gov.uk/datarequest/help DfT» stops & localities for buses
http://orr.gov.uk/statistics/publication-dates Office of Rail and Road publication dates
http://systemed.net/atlas/ Richard Fairhurst’s New Adlestrop Railway Atlas
http://www.barrydoe.co.uk Doe’s directory of printed bus & rail timetables, etc.
http://www.britrail.com Explore Britain with BritRail pass
http://www.cornwallrailwaysociety.org.uk Cornwall Railway Society, A website that provides a nice balance of the current WR railway scene while also reminding us of its rich and varied past
http://www.disused-stations.org.uk Closed railway stations in the
UK▸ http://www.firstgreatwestern.info Great Western Coffee Shop/Passenger Forum
http://www.mrug.org.uk Melksham rail user group
http://www.nationalrail.co.uk/100296.aspx Darwin Data Feeds, real time information
http://www.nationalrail.co.uk/times_fares/ticket_types.aspx Travel tickets on the National Rail network
http://www.passenger.chat Another view of Great Western Coffee Shop/Passenger Forum
http://www.railtechnologymagazine.comhttp://www.realtimetrains.co.uk independent provider of real-time information about train services across the Great British rail network.
http://www.vintagecarriagestrust.org/surveystatus.asp [unavailable url?]
https://communityrail.org.uk Community rail partnerships and groups across Britain
https://en.wikipedia.org Online encyclopaedia of “everything”
https://en.wikipedia.org/wiki/Category:Rail_transporthttps://maps.nls.uk National Library of Scotland, historical map collections
https://transwilts.org TransWilts Community Rail supports the Swindon to Westbury service route
https://www.branchline.uk/PSULintro.php Passenger Train Services over Unusual Lines
https://www.facebook.com/CoffeeShopCRP Coffee Shop passenger forum
https://www.facebook.com/groups/12135242142/ Rail Futures
https://www.gwr.com Great Western Railway, the franchise that runs trains from Paddington!
https://www.southwesternrailway.com/ South Western Railway, the franchise that runs trains from Waterloo
https://www.crosscountrytrains.co.uk/ Franchise that runs cross country trains that do not go to London
https://www.interrail.eu/en Interrail.eu is the official online sales channel for Interrail passes
https://www.journeycheck.com/greatwesternrailway/ Provides current situation report for
GWR▸ services
https://www.journeycheck.com/swr/ Provides current situation report for
SWR» services
https://www.journeycheck.com/crosscountry/ Provides current situation report for Cross Country services
https://www.newsnow.co.uk/h/UK/Travel+&+Transport/Rail News concentration site for travel & transport, trains in this case
https://www.opentraintimes.com More detail about how the railway in Great Britain is running
https://www.railcar.co.uk The History of First Generation
DMUs▸ https://www.railforums.co.uk https://www.recenttraintimes.co.uk Recent Train Times helps you find the trains that arrive punctually and avoid those that are often delayed
https://www.seat61.com Mark Smith, the Man in Seat 61, international train times etc.
https://www.transportfocus.org.uk Our mission is to get the best deal for passengers and road users
https://www.wnxxforum.co.ukhttp://www.railmaponline.com/UKIEMap.php Rail Map online, Historic railways, railroads and tramways