Definitely LMS Coronation Class Pacific! Definitely NOT LNER A4 Class pacific (Mallard etc)
Taking water at speed on any railway line was a precision operation, lower the scoop too early and it damaged on the end of the trough. Lower it too late and insufficient water would be taken, necessitating an additional stop at a water column to refill the tank, thus causing delay. Raise it too late and it broke on the other end of the trough, raise it too early and the passengers in the front of the train would be soaked through any open windows. Trough locations were designated by a large white board with black wavy lines on at the side of the track.