. Railroad structures and estimates . ation for 1 month (June) 72,934 cu. yd. Average daily excavation for June 2805 cu. yd. Delays amounted to 12 per cent of the total time, distributed as follows: per cent moving shovel from one cut to next. per cent no cars, due to trouble at the dump or to main line being used forother per cent per cent shovel per cent derailments in per cent miscellaneous. LAND OR RETAINING WALLS. 57 Land or Retaining Walls. — The amount of land occupied bytrack depression as against track elevation for the same numbero
. Railroad structures and estimates . ation for 1 month (June) 72,934 cu. yd. Average daily excavation for June 2805 cu. yd. Delays amounted to 12 per cent of the total time, distributed as follows: per cent moving shovel from one cut to next. per cent no cars, due to trouble at the dump or to main line being used forother per cent per cent shovel per cent derailments in per cent miscellaneous. LAND OR RETAINING WALLS. 57 Land or Retaining Walls. — The amount of land occupied bytrack depression as against track elevation for the same numberof tracks depends on the amount of elevation or depression of thetracks. In either case, when the fill or cut overruns the landowned by the Company, it may be necessary, on account ofstreets or high cost of land, etc., to build retaining walls. Twocomparative cases are given below, from which it will be notedthat in the case of track elevation with retaining walls the cost is$161 as against $393 per lineal foot for track TABLE 34. Approximate Costs of Track Elevation and Track Depression (for four tracks) PER Lineal Foot. Track elevation with retaining walls. Excavation cu. yd. Backfill cu. yd. Piles, wood .lin. ft. Drainage lin. ft. Concrete, plain cu. yd. Steel reinforcing per lb. Waterproofing .sq. yd. Fill cu. yd. Supervision and contingen-cies about 10 per cent 6 3 60 $ $ Track depression with retaining walls. Excavation cu. yd. Backfill cu. yd. Piles, wood lin. ft. Drainage lin. ft. Concrete, plain cu. yd. Steel reinforcing per lb. Waterproofing walls, .sq. and contingen-cies about 10 per cent Total 1133875 18 1500 9 $ $ $ 58 TYPE OF WALLS, STREET GRADES. The figure (Table 34) shows the amount of land occupied by afour-track viaduct or embankment for track eleva
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