Sorting out the dreck on the computer, found this. Me in '77. Haven't decided yet if I look like a twat. I'm sure someone here can help.
Again from me Dad... "It's an A4 pacific streamlined 4.6.2. Smoke with steam from funnel shows fireman is filling firebox with coal and wispy steam shows the injectors are on pumping water into the boiler. Probably at 75 mph max allowed."
And as an extra for all you train buffs he went on to say "The A4 has 3 cylinders , the third between the frames so 6 power pulses per rev. It is controlled by a conjugated lever connected to the outside cylinders."