Tehachapi Loop


The Tehachapi Loop is a long spiral, or helix, on the Union Pacific Railroad Mojave Subdivision through Tehachapi Pass, of the Tehachapi Mountains in Kern County, south-central California. The line connects Bakersfield and the San Joaquin Valley to Mojave in the Mojave Desert.
Rising at a steady two percent grade, the track gains in elevation in the Loop. Any train more than long passes over itself going around the loop. At the bottom of the loop, the track passes through Tunnel 9, the ninth tunnel built as the railroad worked from Bakersfield.
The line averages approximately 40 trains each day. Due to its frequent trains and scenic setting, the Tehachapi Loop is popular with railfans. In 1998 it was named a National Historic Civil Engineering Landmark and is designated as California Historical Landmark #508.

History

One of the engineering feats of its day, the Loop was built by Southern Pacific Railroad to ease the grade over Tehachapi Pass. Construction began in 1874, and the line opened in 1876. Contributors to the project's construction include Arthur De Wint Foote and the project's chief engineer, William Hood.
The siding on the loop is known as Walong after Southern Pacific District Roadmaster W. A. Long.
The project was constructed under the leadership of Southern Pacific's civil engineers, James R. Strobridge and William Hood, using a predominantly Chinese labor force. The Tehachapi took under two years to complete, featuring 18 tunnels, 10 bridges, and numerous water towers for the steam locomotives. Between 1875-76 about 3,000 Chinese workers equipped with little more than hand tools, picks, shovels, horse-drawn carts and blasting powder cut through solid and decomposed granite to create the helix-shaped 0.73 mile loop with grades averaging about 2.2 percent and an elevation gain of 77 feet. In 1882 the line was extended through Southern California and the Mojave Desert with 8,000 Chinese men working under Strobridge and another man. Both of the men came out of retirement after working on the Central Pacific Railroad.
A large white cross, "The Cross at the Loop", stands atop the hill in the center of the loop in memory of two Southern Pacific Railroad employees killed on May 12, 1989, in a train derailment in San Bernardino, California.
The Tehachapi Depot Museum stands in the nearby town of Tehachapi.

Operations

The Loop became the property of the Union Pacific in 1996, when the Union Pacific and Southern Pacific systems merged. Trains of the BNSF Railway also use the loop under trackage rights.
Although Southern Pacific ran passenger trains on the Loop for years, it banned passenger service there soon after handing its trains to Amtrak in 1971. Union Pacific has maintained the ban since taking over Southern Pacific. As a result, Amtrak's San Joaquin train is unable to directly serve Los Angeles. Amtrak operates Thruway Motorcoach buses for passengers wanting to travel between the Central Valley and Los Angeles.
An exception is made for the Coast Starlight, which uses the line as a detour if its normal route is closed.