. Official proceedings . increases from minimum to maximummore than l-^-)%. The ])erformance of the AL) e(|ui])ment un-der the same conditions only varies to a minor degree, about10%. The variation of propagation speed with leakage is adirect interference with the reliability and flexibility of thebrake control and this comparison represents an im])ortant de-gree of improvement in favor of the AB brake equi])ment. 58 The value of propag-ation si)ee(i for theK equii)ment atminimum leakage is given as about 9.) leet per second. Thisdoes not tell the v^^hole story because in long trains of Kequi]
. Official proceedings . increases from minimum to maximummore than l-^-)%. The ])erformance of the AL) e(|ui])ment un-der the same conditions only varies to a minor degree, about10%. The variation of propagation speed with leakage is adirect interference with the reliability and flexibility of thebrake control and this comparison represents an im])ortant de-gree of improvement in favor of the AB brake equi])ment. 58 The value of propag-ation si)ee(i for theK equii)ment atminimum leakage is given as about 9.) leet per second. Thisdoes not tell the v^^hole story because in long trains of Kequi])ment and with a minimum leakage a full service reductionat the l)rake \a]ve will fail to i)n)])agate beyond the middle of PROPAGATION SPEED 15 LB. SERVICE APPLICATION150 CAR TRAIN FIG. 18 1 MIN. LEAKAGE MAX. LEAKAGE 1 6 100 260 AB MIN. LEAKAGE MAX. LEAKAGE 200 300 400 500 TRANSMISSION VELOCITY- FEET PER SECOND .? so- lo LB. SERVICE REDUCTION. MINIMUM LEAKAGE - 150 CAR TRAINAVERAGE B. C. PRESSURE SECURED ON ENTIRE 60 80 TIME - SECONDS the train unless all the triple valves are in much better thanaverage service condition which was the case for the test fromwhich the value was secured. A direct comparison of the service propagation speedsshown in the diagram indicates that the si)eed of the is from ir)0% to ;?95% lietter than the K equip- 59 nient, this xariaticjii being chiefly in tlie xariations in the opera-tion of the K equi])ment. This improvement is a large fac-tor in the better train control that has been demonstrated inthe loni^ train trials of Ali versus K e(iuii)nient. The superior performance of the AR ecjuii>ment in serviceapplication is shown in the diagram of Figure ID. This chartshows two cur\ es, one for AB and the other for K equip- FIG 20CAR 150 ^^ ^ 100 EM ERGENCY APPLICATION WITHALL CARS CUT OUT. MINIMUM B. P. LEAKAGE. \ ^^--v^ ^ ^ ^ ^ ^\20 ^ ^ , ^^ V CAR 1 40 50 60 TIME - SECONDS ment. The curves are the average value of brake cylinde
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Keywords: ., bookauthorrailwayc, bookcentury1900, bookdecade1900, bookyear1901
