. Electric railway journal . -tery of six 11-cu. ft. capacity pumps on a truck asshown in the illustration. The actual capacity re-quired for the two Ingersoll-Rand tampers used is only32 cu. ft., but double capacity was installed becausethe old machines were not good for continuous serviceat more than 50 per cent loading. These tampers haveproved particularly successful in tamping heavy specialwork. On this railway the machines have allowed sixmen to do the work which formerly required the six men one is stationed to flag vehicles whileanother handles the connection to the trolley
. Electric railway journal . -tery of six 11-cu. ft. capacity pumps on a truck asshown in the illustration. The actual capacity re-quired for the two Ingersoll-Rand tampers used is only32 cu. ft., but double capacity was installed becausethe old machines were not good for continuous serviceat more than 50 per cent loading. These tampers haveproved particularly successful in tamping heavy specialwork. On this railway the machines have allowed sixmen to do the work which formerly required the six men one is stationed to flag vehicles whileanother handles the connection to the trolley wire, leav-ing the remaining four to do the tamping. With labor at $ a day, the relative costs are:Air tamping, $15; hand tamping, $40—a saving of$25 a day. As a matter of fact the tampers paid forthemselves within ten days. These tampers are alsoused for flat tamping of ballast in advance of concret-ing. They are fitted with chisels when wanted forclipping concrete and with cutters when used in strip-ping out TIE TAMPING AT OAKLAND, CAL. August 4, 1917] ELECTRIC RAILWAY JOURNAL 195
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