With an X painted between the cabside number plate and the axle weight code (which is E) - which according to 'Collett and Hawksworth Locomotives' P127 (Brian Haresnape, 1978) the 'X' indicated the loco was permitted to take loads above those set out in the working books. It isn't explained why.....though maybe it is because the locomotive had additional row to its superheater or a re-draughted boiler?

I cannot recall ever seeing a loco with the cab weather sheet attached to the tender whilst on shed.