. Revised and enlarged ed. of the science of railways . a-tor work properly: that the pump governor stopsthe pump when the desired maximum pressureis reached, and starts it again when pressureis reduced; that the engineers brake valveworks properly in all the different positions ofthe handle; that both pointers of the air gaugeindicate the same thing when the handle isplaced in position one; that when the brakes arefully applied, the driver brake pistons do nottravel less than one-fourth nor more than one-half of their stroke; that the engine truck andtender brake pistons travel between one -
. Revised and enlarged ed. of the science of railways . a-tor work properly: that the pump governor stopsthe pump when the desired maximum pressureis reached, and starts it again when pressureis reduced; that the engineers brake valveworks properly in all the different positions ofthe handle; that both pointers of the air gaugeindicate the same thing when the handle isplaced in position one; that when the brakes arefully applied, the driver brake pistons do nottravel less than one-fourth nor more than one-half of their stroke; that the engine truck andtender brake pistons travel between one - halfand three-fourths of their cylinder length; and,finally, that the tender brake piston does nottravel less than five nor more than eight ,, the reservoirs and drain cups shouldbe drained of all water by opening their dripcocks. The train pipe should also be blown outthrough the rear hose, with the brake valve han-dle in full release (position one), to be sure thatit is not obstructed with dirt or otherwise. 316 RAIL ^yA Y EQ Engineers Brake Valve with Feed Valve Attachment, and Duplex AirGauge, known as E C. THE AIR BRAKE. 317 Engineers should also report to the roundhouseforeman, or other authorized official, at the endof each run, an}^ defect the}^ may have detectedin the air-brake apparatus. On Making Up Trains and Testing Brakes.—There should be seventy pounds train pipe press-ure on the engine before connecting to the train,Avith the handle of the engineers valve standingin position two. When the locomotive has beencoupled to the train and the latter has beencharged with an air pressure of seventy pounds,the engineer should, on a signal from the properperson, apply the brakes fully and leave themthus until the brakes on the entire train havebeen inspected, after which, upon signal, thebrakes should be released; but the engineer willnot leave the station until all the brakes arereleased and he has been advised by the properperson that they oper
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