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I would go back and have another look at your source.
All the pit trippers and other mainline class 9 jobs we had at HM were booked to run at 35mph.
If a Class 9 train ran at 25 mph this would be shown on a BR
Form29973. This would be shown on the driver slip as a 9X
EG A train which had a mechanical shunter in tow. These engines had thier transmissions de meshed and connecting rods removed.
This 29973 would enumerate any speed restrictions on the route of the train or any other special instructions needed to work the train.
At one time class 9 trains were the norm for freight on the mainlines and I worked class 9 trains everyday for 10 years on ballast turns and pit trippers and inter regional work.
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