Diesel? It just has to be the English Electric Deltic. They made one prototype and only 22 production models. The Prototype is in the Science Museum and there are 6 preserved production Deltics. 27% preservation rate shows how well loved they were. There are also several cabs preserved in museums.
In case anyone wonders why there were only 22 produced, it was a bad case of politics.
Steam? Well either 6000 King George V that stole the show at the Baltimore and Ohio centenary. In the pageant there were many huge powerful American locomotives then came this comparitively small loco built to English loading guage. Famously Driver Young set the cut off for maximum expansion and shut down the regulator so this tiny loco cruised past the crowd pulling a long train in silence.
Alternatively 3717 City of Truro. A small loco even by English standards this 4-4-0 could still haul long trains when she was an old lady but she was famous for being the first locomotive to exceed 100 mph back in 1904.
In case anyone wonders why there were only 22 produced, it was a bad case of politics.

Steam? Well either 6000 King George V that stole the show at the Baltimore and Ohio centenary. In the pageant there were many huge powerful American locomotives then came this comparitively small loco built to English loading guage. Famously Driver Young set the cut off for maximum expansion and shut down the regulator so this tiny loco cruised past the crowd pulling a long train in silence.

Alternatively 3717 City of Truro. A small loco even by English standards this 4-4-0 could still haul long trains when she was an old lady but she was famous for being the first locomotive to exceed 100 mph back in 1904.

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