LNER Gresley 4-6-2 A3 - 60097 "Humorist" taking water at Hellifield probably on a Thames Clyde Express - note- looks like the headboard code board is falling off plus it was the only one of the class with large smoke deflectors
G Robinson.
I remember standing next to my father and taking pictures of this with a little brownie camera - alas I double pressed the button and got a double image, spoiling the picture.