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