If you've got 40 minutes to spare, this video might interest you. It's a driver's eye view of one of the Great Railway Journeys of the World - Bristol to Severn Beach! To be honest I think the passengers get a better view.
It's a bit frustrating to see all that space where the second track could be! Things get a bit nauseating north of St Andrews Road - I don't remember the track being that bad, but the camera keeps wilting and the picture seems to develop a visual migraine. But all good fun.
https://www.youtube.com/watch?v=ikQjyKV1Nkc