More information about the crane - enquires were apparently made with Grafton some years ago about this crane. Grafton refused to accept they had manufactured this machine, on the basis that this crane's build number matched a crane which had been built for a ship which then sunk. The belief is that this crane was retrieved from the ship before disaster struck, and rebuilt for rail use. Further investigation suggests that it was rebuilt from a Steam Crane. Ex MoD - Bramley ammunition depot. It's been at it's current location since at least 2013 and probably some years before that.
Damn, this is very interesting! Thanks for doing the digging