David J Haes adds his comments A fine study of what looks very much like an iron-ore service, which has most likely originated on the Eastern Region, possibly from one of the ironstone operations then still active in the Grantham area, such as at Harlaxton. Although just another guess on my part, the 9M91 London Midland destination headcode may have been for Stanton Gate, just to the North of Toton.