. Locomotive engineering : a practical journal of railway motive power and rolling stock . rake of this name. Odd brakes,because of their difference from standardforms, arc frequently referred to in in-stances where they interfere with theoperation of the latter kind. (74) E. H. G., Carlisle, Pa., asks:Why is it that the air cylinder of theair pump sometimes gets very hot? Ihave heard of it acting in this manner. I. 01jje<11 made, on .1count of a belief thai brakes on the Icad-uck would interfere with the enginegoing around curves; but inasmuch thatthe brake is contained on the truck, thisa
. Locomotive engineering : a practical journal of railway motive power and rolling stock . rake of this name. Odd brakes,because of their difference from standardforms, arc frequently referred to in in-stances where they interfere with theoperation of the latter kind. (74) E. H. G., Carlisle, Pa., asks:Why is it that the air cylinder of theair pump sometimes gets very hot? Ihave heard of it acting in this manner. I. 01jje<11 made, on .1count of a belief thai brakes on the Icad-uck would interfere with the enginegoing around curves; but inasmuch thatthe brake is contained on the truck, thisargument is weak and without founda-tion. This is proven by the fact that thefastest trains in the country are equippedwith engine truck brakes. 177) F. E. M., Jacksonville, 111., writes: Which should be the p1 J ndlc, running or full re- lease, while backing a passenger traininto 1 with train men handling brakes fron <i of the train? A.— Both positions are used with apparentgood results. When departing from theusual method t ti 1 r handling the brakes, it is difficult to advise. I. C. & O. INSTHTJCTION CAR. A.—In compressing air, heat naturallyfollows, unless some cooling means isemployed. Unnatural heating is prin-cipally caused by restricted air passages,insufficient lift of air valves, leaky packingrings and badly worn air cylinder. (75) J- P- L., Toledo. asks: Are automatic air brakes used on streetcar lines, and if so, where? A.—We donot know where any are being a number of straight air brakes,however, are in operation on lines havingheavy trolley cars. An eccentric on theaxle pumps the air. and a brake valve,operated by the motorman, admits andreleases pressure from the brake on the One Hundred and Twenty-fifth Street line. New York, propelled bycompressed air. have straight air brakes. (76) L. E. B., Frankfort, Ky., asks:Are air brakes on the engine trucks used? If not. why not? A.—Truckbrakes are gradually gaining headway and ever
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