page_title: First Transcontinental Railroad
section_title: Central Pacific route
hierarchical_section_title: First Transcontinental Railroad / Transcontinental route / Central Pacific route
caption_attribution_description: English: Advertisement for the opening of the Dutch Flat Wagon Road, June 15, 1864.
context_page_description: The First Transcontinental Railroad was a 1,912-mile continuous railroad line constructed between 1863 and 1869 that connected the existing eastern U.S. rail network at Council Bluffs, Iowa with the Pacific coast at the Oakland Long Wharf on San Francisco Bay. The rail line was built by three private companies over public lands provided by extensive US land grants. Construction was financed by both state and US government subsidy bonds as well as by company issued mortgage bonds. The Western Pacific Railroad Company built 132 mi of track from the road's western terminus at Alameda/Oakland to Sacramento, California. The Central Pacific Railroad Company of California constructed 690 mi eastward from Sacramento to Promontory Summit, Utah Territory. The Union Pacific Railroad built 1,085 mi from the road's eastern terminus at the Missouri River settlements of Council Bluffs and Omaha, Nebraska westward to Promontory Summit.
  The railroad opened for through traffic between Sacramento and Omaha on May 10, 1869, when CPRR President Leland Stanford ceremonially tapped the gold "Last Spike" with a silver hammer at Promontory Summit.
context_section_description: The Central Pacific laid 690 miles (1,110 km) of track, starting in Sacramento, California, in 1863 and continuing over the rugged 7,000-foot (2,100 m) Sierra Nevada mountains at Donner Pass into the new state of Nevada. The elevation change from Sacramento (elev. 40 ft or 12 m) to Donner Summit (elev. 7,000 ft or 2,100 m) had to be accomplished in about 90 miles (140 km) with an average elevation change of 76 feet per mile (14 meters per km), and there were only a few places in the Sierra where this type of "ramp" existed. The discovery and detailed map survey with profiles and elevations of this route over the Sierra Nevada is credited to Theodore Judah, chief engineer of the Central Pacific Railroad until his death in 1863. This route is up a ridge between the North fork of the American River on the south and Bear River (Feather River) and South Yuba River on the north. As the railroad climbed out of Sacramento up to Donner Summit, there was only one 3-mile (4.8 km) section near "Cape Horn CPRR" where the railroad grade slightly exceeded two percent.
  In June 1864, the Central Pacific railroad entrepreneurs opened Dutch Flat and Donner Lake Wagon Road (DFDLWR). Costing about $300,000 and a years worth of work, this toll road wagon route was opened over much of the route the Central Pacific railroad (CPRR) would use over Donner Summit to carry freight and passengers needed by the CPRR and to carry other cargo over their toll road to and from the ever-advancing railhead and over the Sierra to the gold and silver mining towns of Nevada. As the railroad advanced, their freight rates with the combined rail and wagon shipments would become much more competitive. The volume of the toll road freight traffic to Nevada was estimated to be about $13,000,000 a year as the Comstock Lode boomed, and getting even part of this freight traffic would help pay for the railroad construction. When the railroad reached Reno, it had the majority of all Nevada freight shipments, and the price of goods in Nevada dropped significantly as the freight charges to Nevada dropped significantly. The rail route over the Sierras followed the general route of the Truckee branch of the California Trail, going east over Donner Pass and down the rugged Truckee River valley.
  The route over the Sierra had been plotted out by Judah in preliminary surveys before his death in 1863. Judah's deputy, Samuel S. Montague was appointed as Central Pacific's new Chief Engineer, with Lewis M. Clement as Assistant Chief Engineer and Charles Cadwalader as second assistant. To build the new railroad, detailed surveys had to be run that showed where the cuts, fills, trestles, bridges and tunnels would have to be built. Work that was identified as taking a long time was started as soon as its projected track location could be ascertained and work crews, supplies and road work equipment found to be sent ahead. Tunnels, trestles and bridges were nearly all built this way. The spread-out nature of the work resulted in the work being split into two divisions, with L.M. Clement taking the upper division from Blue Cañon to Truckee and Cadwalader taking the lower division from Truckee to the Nevada border. Other assistant engineers were assigned to specific tasks such as building a bridge, tunnel or trestle which was done by the workers under experienced supervisors.
  In total, the Central Pacific had eleven tunnel projects (Nos. 3 through 13) under construction in the Sierra from 1865–68, with seven tunnels located in a 2-mile (3.2 km) stretch on the east side of Donner Summit. The tunnels were usually built by drilling a series of holes in the tunnel face, filling them with black powder and detonating it to break the rock free. The black powder was provided by the California Powder Works near Santa Cruz, California. These works had started production in 1864 after the U.S. Civil War had cut off shipments of black powder from the East to the mining and railroad industry of California and Nevada. The Central Pacific was a prolific user of black powder, often using up to 500 kegs of 
caption: 1864 advertisement for the opening of the Dutch Flat Wagon Road
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