LNER Gresley K3/2 class mogul no. 1133 taken in 1936 just north of Doncaster. The supplied data was somewhat vague but Vic Smith has kindly filled in the blanks: the photo was taken at Ings Road crossing looking south towards Doncaster station. The bridge in the background carried the Doncaster avoiding line.
No. 1133 became 61909 in August 1948 under BR ownership and worked as a St. Margaret's allocated engine until withdrawal in March 1960.