Robert Stephenson's Planet class locomotive was the first true design of mainline express passenger locomotive. Delivered less than a year after Rocket it was one of the most successful early locomotive designs. Planet set the mold for British locomotive design for more than the next century featuring a multi tubular boiler; inside cylinders; crank axle; and the first use of proper frames.
The Planet class, and its 0-4-0 Samson derivative,...
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