Some useful and interesting links, in no particular order:
Severn Valley Railway – one the the UK’s premier heritage railways
All The Stations – Geoff Marshall and Vicki Pipe visited all the UK mainline railway stations in 2017 for a vlog and book. See their travels on Youtube
Seat 61 – THE definitive guide to world rail travel
Railforums – UK railway discussion forums, a huge amount of knowledge and information
Every Disused Station – Ambitious project by Paul and Rebecca Whitewick to visit and document all the disused stations in Britain. Follow them on Youtube
The Heart of Wales Line – one of Wales’s loveliest railways
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