Transportation and Disposal.
The track on the surface and in the tunnels was of 20-lb. rails on a 2-ft. gauge.
The excavation was handled in scale-boxes carried on flat cars, and the concrete in 1¼-cu. yd. mining cars dumping either at the side or end.
PLATE XXXV.
TRANS. AM. SOC. CIV. ENGRS.
VOL. LXVIII, No. 1155.
HEWETT AND BROWN ON
PENNSYLVANIA R. R. TUNNELS: NORTH RIVER TUNNELS.
TABLE 17.—Cost of Conduit Work.
| Manhattan. | Weehawken. | Total. | |
|---|---|---|---|
| Duct feet | 115,962 | 35,155 | 151,117 |
| Average Cost per Duct Foot. | |||
| Labor | $0.035 | $0.032 | $0.034 |
| Material | 0.043 | 0.052 | 0.045 |
| Total field charges | 0.078 | 0.084 | 0.079 |
| Chief office and plant depreciation | 0.005 | 0.008 | 0.006 |
| Total average cost | $0.083 | $0.092 | $0.085 |