I’ve no idea whether it’s railway or not, but it’s an early large-pump FL6 (~1938 -1940: XN control cock; brass ID plaque). Cheers Tony
It seems to be a misconception held by some members that Tilley made railway lamps. They didn't - they just made lamps. There was no restriction on who bought them, although some companies did commission Tilley to make a batch of lamps for them and generally had them painted in a different colour. That FL6 could have been sold to absolutely anybody and therefore the white marking could mean anything. If it was railway it's more likely to have something like PW (Permanent Way i.e. the track itself) marked on it to stop it being purloined by other gangs / crews. I've also got a very elderly PL 53/5/6 with GWR punched into the foot rim - presumably for Great Western Railway (or Gresley Was Right as we tend to say in LNER country). So to answer the question posed at the top of the thread, I'd say 'remote' and impossible to prove one way or the other...