In the 80's I frequently used the South coast to North-east services from Birmingham to Sheffield. Often the loco from Birmingham was a 31 instead of the booked 45/47. Loads were 6 or 6+van. The 31 would usually time the train to Chesterfield but could'nt do the same on the 1 in 100 climb to Bradway tunnel - we were usually 5 late into Sheffield.
As an aside, it seems incredible that they used to change the engines at Brum, sometimes having done the same at Reading!
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