31 251 Postland
On an even drearier day than the previous photo, November 16th 1981, the 06.00 Thornton Fields - York Yard South cripple coaches trundles past Postland on the March to Spalding section. I took this from the signalbox which was welcome shelter.
At the time this train ran on Mondays & Wednesdays. 31251 was a March based loco from 1970 - 1984 after which it became 31442.