I always wondered about the weird angle of the photo and now that you mention it, yes, it does look like it is trains seats that blocking the full face view.
But than I never saw CCTV being positioned between/behind the train seats in this angle. I wonder if other passenger took this photo and the reason why police showed up later on and also have this photo ...
Until now I assumed that he just did not pay the fare.
Anyway, other things to explore - name - William Fraser (or Frazer) and also his red bracelet with black beads. It is visible on his left arm in some photos.