Anyone what this is from?
Heavy piece of kit
Non Railway but just liked it, Road Traffic Act 1933, vehicle plate, might be from a horse drawn yoke?
SWL plate, probably from one of those hand cranked cranes that used be on loading banks.
EDIT 4 1/2 T might be a bit much for those, perhaps a small travelling crane.
Second one, could be bus or truck.
No way of knowing unless you trawl the records with the number.