. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . The No. 5 Nevsr York Duplex Air Pump. The monster locomotive and the 100-car train have made it necessary to bring & DP 525 OP 44. — B DP 56 DP 53 FIG. YORK DUPLEX AIR PlMP, No. 5. out a large new air compressor of suffi-cient capacity to supply the quantity ofair required to operate the brakes prop-erly and also to provide a sufficient sup- Fn;. 3. NEW YORK DUPLEX AIK PUMP. No. 5. to the introduction of the large airpump for the reason that a large pumpseemed to them to invite still gr
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . The No. 5 Nevsr York Duplex Air Pump. The monster locomotive and the 100-car train have made it necessary to bring & DP 525 OP 44. — B DP 56 DP 53 FIG. YORK DUPLEX AIR PlMP, No. 5. out a large new air compressor of suffi-cient capacity to supply the quantity ofair required to operate the brakes prop-erly and also to provide a sufficient sup- Fn;. 3. NEW YORK DUPLEX AIK PUMP. No. 5. to the introduction of the large airpump for the reason that a large pumpseemed to them to invite still greaterneglect of train pipe leakage than is nowexperienced. This stand was probably well takenwhen trnin^ consisted of not more or Oo cars, all eight-inchequipments; for then the pres-ent air pump had ample capac-ity to supply the train with therequired quantity of air. pro-vided, of course, no excessiveleakage was allowed tn obtainin the brake mechanism. Butsince the locomotive is gradu-ally growing larger in size, andso with the train in proportion,it is easily seen that a large airpump applied to this class oflocomotives may hold the samerelation to it, and the trnin it iscapable of hauling, that thesmaller pumps
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