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I cannot give any estimates on the trestles or the many bridges, some of which wereover a thousandfeet long; and then there was the lining and shoring inside the tunnels.Both railroads constructed hundreds, if not thousandsof buildings, most of them were huge in size, Depots, Warehouses, buildings for housing employees stationed along the lineand the like.About 200,000 net tons of iron total were used just for building the railroad from Omaha to Sacramento [at 2000 lbs/net ton, the modern useage, also called the short ton; the metric ton = 1000 kg ].Details, at 60 lb/yard (per single rail) single track from Omaha to Sacramento: 1776 miles x 60 lb/yard x 5280 feet/mile x 1/3 yards/feet x 2 rails x 1/2000 ton/lb = (1776*60*5280*2)/(3*2000) = 187,546 tons of iron.

Using that method of measurement the Central Pacific railroads 690 miles of track would have been approximately 69,000 (metric tons 2240#) tons of rail.D., Harvard Economic Studies, 1908, states on page 256 that: " ... both principal and interest were paid in full." Regarding the CPRR and Western Pacific RR, Tutorow, p.1004 reports that final payment to the government was organized by a commission appointed by an 1898 act of congress, determined to be ,812,715.48 on Feb.I would think that [the above] estimate of approximately 200,000 tons of iron, just for the track, is as close as you will ever get without access to the original records scattered in archives across the country, and then it is doubtful they are even close to being complete.On the matter of engines, there was 159 engines built for the CPRR between 1863 and May 1869 and 152 engines built for the UPRR during the same period.

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