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Prev. Page   Next Page V Vacuum Brake Each vehicle of an vacuum braked train will have a cylinder with a partial vacuum on both the ‘train pipe’ and ‘reservoir’ sides of the piston while the brakes are off. The brakes are applied by allowing air into the train pipe side, the resulting pressure differential will put the brakes on. Vacuum Cylinder Each coach and wagon employing vacuum brakes carried a vacuum cylinder (and sometimes two) to provide the force to apply the brakes when the vacuum in the brake pipe was removed. It is usally clearly visible hanging from the underframe looking like a cauldron approx 2ft in diameter and 18in deep, with operating rod emerging from the bottom. This was a development of the Vacuum Sack. Vacuum Sack Seen hanging from the underframe, with the rodding emerging fore and aft to operate the brakes on carriages and wagons. Later repalced with the Vacuum Cylinder. Valve Chest The chest or chamber that contains the mechanism that controls the admission of steam into the cylinders. Valve-Chest Lubricators These were a Displacement Lubricator that oiled the moving parts in the Valve Chest. Valve Gear The system of rods and cranks which connect the pistons and valves to the wheels and controls the admission of steam to the cylinders. See Baker, Bulleid, Caprotti, Cossart, Gooch, Joy, Stephenson and Walschaerts valve gear. Valve Rod A rod which is connected to the moving part of a valve. Aka Valve Spindle Valve Spindle A rod which is connected to the moving part of a valve. AKA Valve Rod Valves In a steam engine, steam has to be admitted to and exhausted from, the cylinders at the right moment in the cycle. This is achieved by a valve arrangement inside the steam chest, which is located next to each cylinder. Van A railway goods vehicle which has a roof. Viaduct A long bridge-like structure, typically a series of arches, carrying a railway across a valley or other low ground. Viaduct Works ?? Became Earlestown Wagon Works Vulcan Foundry A major locomotive builder, whose works were a few hundred yards south of Earlestown station.

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