LSWR H15 class
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The LSWR/SR H15 class was a class of 2-cylinder 4-6-0 steam locomotives designed by Robert Urie for mixed-traffic duties on the LSWR. Further batches were constructed by Richard Maunsell for the Southern Railway after 1923. They were given the nickname of "Junior King Arthur" due to the size of their driving wheels, the S15 and their N15 cousins had driving wheels which had a diameter of 5 foot and 7 inches and 6 foot and 7 inches respectively.
Official 1914 LSWR works photograph of Urie H15 class mixed-traffic locomotive No. 483 at Eastleigh. Smoke deflectors were fitted during the early 1930s.
H15 30478 approaching Clapham Junction 1958
Superheater
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A superheater is a device used to convert saturated steam or wet steam into superheated steam or dry steam. Superheated steam is used in steam turbines for electricity generation, in some steam engines, and in processes such as steam reforming. There are three types of superheaters: radiant, convection, and separately fired. A superheater can vary in size from a few tens of feet to several hundred feet.
General arrangement of a superheater installation in a steam locomotive.
Superheater viewed from the smokebox. Top centre is the superheater header, with pipes leading to cylinders. Tubes below feed steam into and out of the superheater elements within the flues. The stack and the damper have been removed for clarity.
Early color photograph from Russia taken by Sergey Prokudin-Gorsky in 1910 of steam locomotive with a superheater