. Locomotive engineering : a practical journal of railway motive power and rolling stock . -longing to it should go with it. Experi-ence has decreed that locomotive and trainbrakes shall act continuously; but if goodpractice should require a supplementarydevice to assist the driver brake in re-taining or releasing its pressure at theoption of the engineer, that device should1),- called a fitting name, possibly op-tional retaining and release valve; butnever independent driver brake. SOI chine, and the publication of a letter froma correspondent who questions the abilityand advisability of rail
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. Locomotive engineering : a practical journal of railway motive power and rolling stock . -longing to it should go with it. Experi-ence has decreed that locomotive and trainbrakes shall act continuously; but if goodpractice should require a supplementarydevice to assist the driver brake in re-taining or releasing its pressure at theoption of the engineer, that device should1), - called a fitting name, possibly op-tional retaining and release valve; butnever independent driver brake. SOI chine, and the publication of a letter froma correspondent who questions the abilityand advisability of railroad shops doingthis work. Note both carefully. The testing of a driver brake by coup-ling an air gage to it will, in most cases, reveal a misplaced confidence in the sup-posed good work the brake has been doing.The gage test is the only reliable test. Acorrespondent truly states the case whenhi says the question is not how long thepiston stays out, but how much pressurei; being maintained in the cylinder. Quite a number of the railroads are nowplacing the air pump on the left-hand side. FIG. 4. TRIPLE PISTON RING GRINUINGMACHINE. any? A.—We are not clear on what youmean by the automatic driver brake re-lease valve, but assume you refer to thespecial valve sometimes used on switchengines, and which is placed in the pipebetween the triple and brake cylinder, sothe brake cylinder pressure can be re-leased quickly and without passing backthrough the triple valve. This form ofvalve is used on some switch engines hav-ing large brake cylinders and old plaintriples, which make the release too slowfor quick switching work in the yard. Inroad work this quick release is avoidedrather than sought. A slower release isdesired, as the slack of the train is therebybetter controlled, and break-in-twos areless likely to happen.