Not seen on the railway, but from the railway: I was travelling to Norwich when the well-filled train I was on had to be taken out of service because of a brake problem. We all joined the next train, which was also well-filled. Somewhere around Oakham we passed a lone man standing in a field, wearing not a stitch of clothing and looking very embarrassed. I never did work out what he might have been doing - it was a cool day and there was nothing to swim in nearby.