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(Not sure if the weights of locomotives listed are shipping weight or maximum track loading including water.) If you estimate from the available data that about 21,000 miles of track were put in place during the 1860's in the U. and that the amount of iron used is proportional to the track miles built, then the percent of iron used in building the transcontinental railroad (compared to all U. railroads' iron use during 1860's construction) is about: (1,776/21,000)*100 = 8.5% According to Galloway: "The number of ties varied from 2,260 to 2,640 per mile, depending upon alignment and grade. The total completed length of the sheds and galleries was about thirty-seven miles, the building of which consumed 65,000,000 feet board measure of lumber and 900 tons of bolts, spikes, and other iron." of rail was accounted for, as shown by a letter from Collis P.Huntington, in New York, dated 1873, to a supplier of rail, The Pennsylvania Iron Co., in Danville, Pennsylvania. Huntington says, in part that he contracted to buy ' ...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.That would requireagreat deal of research to even estimate. This should be an easy one to develop a reasonable estimate as there was an average of about 2,500 wood ties per mile over the entire 1,776 miles of the transcontinental railroad.The average size of the tie was 6"x8" x 8 feet long. I'll leave that one for you to figure out the Board Feet required. Then there were the side tracks which amounted to about 10% of the mainline track.1, 1899, and that the complex transaction was completed on February 1, 1909 when the last of the government debt was duly paid.

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.

The greatest amount of lumber used for one project was the 37 miles of Snow Sheds, as mentioned above.

Some other major uses for lumber: There were many, many wooden trestles, most of them were huge and they required an enormous amount of lumber.

The ties varied in size, some as long as 10 feet and some as large as 8"x10" in size, depending if the track was being laid in the mountains or the deserts, on heavy or gentle grades, on curves or tangents (straight track). At one time the Central Pacific had as many as 25 Saw Mills in Truckee just milling lumber for the railroad which required as many as 40 trains to supply the front withties and timber– and they just managed to keep up with the track laying forces.

Entire forests were cut back for miles from the line, some taking a hundred years or more to recover.