Any brake operated by air pressure, but usually restricted to systems of continuous brakes operated by compressed air, in distinction from Vacuum Brakes, which are operated by creating a vacuum. If the valve has no lead, admission takes place at the moment the piston of its stroke and just as it is to begin the return stroke. Admission The opening of steam port to admit steam to one end of a cylinder. Adjusting spring seat A casting, or a part of the bolster of a two-wheel trailing truck, forming a bearing for the end of the adjusting spring. Adjusting spring caseĪ cylindrical cast-iron holder in which an adjusting string is placed. Adhesive weight The weight on the driving wheels of a locomotive, which determines the frictional grip between wheels and rail, and hence the drawbar pull a locomotive can exert Adjusting spring A heavy spiral spring or nest of springs used for controlling the side motion of a two-wheel radial trailing truck. Adhesion railway The most common type of railway, where power is applied by driving some or all of the wheels of the locomotive.

A general term used to finish the ends of rods of various forms.

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