. Electric railway journal . PNEUMATIC TIETAMPING—FIG. 1—TYPICAL TAMP-ING MACHINE The pneumatic tamper operates most efficiently onair at 65 lb. to 75 lb. pressure. In terminal yards andon systems where electro-pneumatic signals are used ithas been found both convenient and entirely practicalto use air from the signal service line, as the smallamount used does not impair the operation of the sig-nals. In ordinary traction work air is supplied froma portable compressor, usually electric driven. The cus-tomary provision of 300 ft. of hose gives a large work-ing radius without moving the compress
. Electric railway journal . PNEUMATIC TIETAMPING—FIG. 1—TYPICAL TAMP-ING MACHINE The pneumatic tamper operates most efficiently onair at 65 lb. to 75 lb. pressure. In terminal yards andon systems where electro-pneumatic signals are used ithas been found both convenient and entirely practicalto use air from the signal service line, as the smallamount used does not impair the operation of the sig-nals. In ordinary traction work air is supplied froma portable compressor, usually electric driven. The cus-tomary provision of 300 ft. of hose gives a large work-ing radius without moving the compressor. While the pneumatic tie tamper works in any kind ofballast it is advisable to change the dimensions of thetamping bar face to suit the size of ballast and thussecure maximum effect from the available power. In. PNEUMATIC TIE TAMPING—FIG. 2—A WORKING UNIT. TWOMEN WITH TAMPERS AND ONE MAN SHOVELING BALLAST crushed stone, 2 in. or over in size, a bar with a face3 in. x % in- gives best satisfaction; with smaller stoneor gravel a tamping face 3 in. x 7/8 in. is most effectiveand in tamping sand, dirt or cinders a still larger face,3 in. x 1% in. secures the greatest efficiency. It is interesting to note the experiences of severalelectric railways with the pneumatic tamping ma-chines. The Public Service Railway of New Jersey in ex-tending its trackage in East Orange started tampingwith two pneumatic tampers operated from a portablecompressor (Fig. 3). The average days work of threemen, two tampers and a shoveler, was sixty ties tampedon both sides for their whole length. Two-inch stoneballast was used and the track lifted 6 in. The fore-mans comment to the writer was that ten men handtamping might beat the two machines but six mencould not keep up with them. To expedite still further 534 ELEC
Size: 1835px × 1361px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
