tunnels were all made with the new dangerous nitroglycerine explosive, which expedited work but caused some fatal accidents. While building the railroad along the rugged Weber River Canyon, Mormon workers signed the Thousand Mile Tree which was lone tree alongside the track from Omaha. A historic marker has been placed there. The tracks reached Ogden, Utah, on March 8, 1869, although finishing work would continue on the tracks, tunnels and bridges in Weber Canyon for over a year. From Ogden, the railroad went north of the Great Salt Lake to Brigham City and Corinne using Mormon workers, before finally connecting with the Central Pacific Railroad at Promontory Summit in Utah territory on May 10, 1869. Some Union Pacific officers declined to pay the Mormons all of the agreed upon construction costs of the work through Weber Canyon, and beyond, claiming Union Pacific poverty despite the millions they had extracted through the Crédit Mobilier of America scandal. Only partial payment was secured through court actions against Union Pacific. Central Pacific route The Central Pacific laid of track, starting in Sacramento, California, in 1863 and continuing over the rugged Sierra Nevada mountains at Donner Pass into the new state of Nevada. The elevation change from Sacramento (elev. ) to Donner Summit (elev. ) had to be accomplished in about 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 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