. Revised and enlarged ed. of the science of railways . Coc« On«. THE PLAIK STRAIGHT-WATCOCK. THE AIR BRAKE. 373 F/CW. car is equipped with a quick-actiou brake in workingorder. (Fig. X shows theappearance of a freightbrake with a quick-actiontriple valve attached.) No more than three pipedcars* or cars equipped withthe plain triple valve (see Fig. C) should be placedtogether in a train, as quick action may not skipthese cars and apply the brakes behind themproperly in V . ; I 7ff/f/.£

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