|Picture - Mandy Grant|
The P2s were conceived to haul heavy trains over the Edinburgh to Aberdeen route. The original scheme combined the 2-8-2 wheel arrangement with an A3 boiler but this was subsequently worked up into a design with a longer firebox and double chimney. The 2-8-2s were the most powerful express passenger locomotives to run in Great Britain and their mechanical innovations were matched by their bold outward appearance. The doyen of the class, No. 2001 Cock o’ the North, was radically equipped with Lenz rotary valve gear, an ACFI feed water heater in place of injectors, a 50 sq. ft. fire-grate and streamlined steam passages to three cylinders which exhausted via a double Kylchap chimney. Gresley was greatly influenced by the work of the French engineer Andre Chapelon who had pioneered the use of these features and was determined to incorporate them in the P2s. Externally the design hid the tapered boiler in a parallel, elliptical cladding running from a V-fronted cab to a muscular, streamlined smoke-box (which incorporated integrated smoke deflectors), the whole affair sitting on a high running board which exposed the 6’2″ drivers entirely. The 220lb/sq in boiler fed three 21″ x 26″ cylinders and the locomotive developed a nominal tractive effort of 43,460lb. As a final touch Cock o’ the North was the first L.N.E.R. loco to carry a chime whistle.
Visit the P2 website for more information about the project https://www.p2steam.com/category/news/
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