the whole arrangement of the parts , as well as in the excellence of the materials selected for the construction , both durability and economy of repair have been kept in view . Smaller engines of this dass on the same railway have 7 - feet driving wheels , with cylinders 17 inches in diameter ,… … Fig . 540 . « — London and North - Western Railway Passenger Engine . a , Fire box . B , Fire door . c , Fire - brick arch . d , Air holes . e , Ash pan . f , Body of boiler . G , Smoke box . h , Chimney . 1 , Steam ehest and regulator . k , Safety valves . l , Cylinder . M , Valve ehest . N ,…
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