Compared with today's ubiquitous European wide Class 66 the Class 31 is almost a friendly little locomotive. Responsive straight air brake making it ideal for shunting. I worked on them regularly on Kings Lynn expresses and sometimes when pressed into service on Norwich - Liverpool St trains due to shortages of a 47. My abiding memory of them creeping around Stratford Station at 15mph was they sounded like a bag of cans!
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