Graham - you have just quoted The Star - the paper that brought us "London Bus Found On The Moon." I need say no more

I don't totally believe The Star:
Sunbathing on railway property, whether dressed or undressed, would be considered trespassing and is not recommended.
Having walked across the Barmouth Bridge to Morfa Mawddach on a sunny July day, and just missed the 15:46 to Tygwyn because I dawdled a bit too long on the bridge, I believe I could unroll my towel on the platform, take of my shirt, and lay down to take a bit of sun as I waited on railway property for the next train at 17:49