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· Registered
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Hello and welcome to the Forum.

Most questions about the real-life railways we tend to handle in the 'Prototype' section of this Forum. - Topic now moved.

The 'special coach' you refer to is a 'dynamometer car'. This measures the pull of the loco upon the train and its speed - from this the power output of the locomotive at any instant can be calculated. Various other measurements can also be taken to assist looking at the efficiency of the locomotive at various speeds and loads.

The LNER dynanometer car from 1906, used during Mallard's famous run, is preserved at the National Railway Museum at York. I recall there were some 5 other coaches in Mallard's train but I don't know the details.

John Webb

PS Doug beat me to it in greater detail!
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