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The Tehachapi Loop is a 0.73-mile (1.17 km) long 'spiral', or helix, on the Union Pacific Railroad line 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. Seeing a daily average of almost 40 trains, the line is one of the busiest single-track mainlines in the world.
With its frequent trains and spectacular scenery, the Loop is one of the prime railfan areas in the country. In 1998, the Loop was named a National Historic Civil Engineering Landmark and is now California Historical Landmark #508.
One of the engineering feats of its day, the Loop was built by Southern Pacific Railroad beginning in 1874, and opened in 1876. Contributors to the project's construction include Arthur De Wint Foote and the project's chief engineer, William Hood.
On the loop, the track passes over itself, lessening the grade. The loop gains 77 feet (23 m) in elevation as the track climbs at a steady 2% grade. A train more than 4,000 feet (1,200 m) long thus 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.
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.
A railroad museum stands in the nearby town of Tehachapi.
The Loop became the property of the Union Pacific in 1996, when it absorbed the Southern Pacific. Trains of the BNSF Railway also use the loop under trackage rights. Union Pacific bars passenger trains from the line, which prevents Amtrak's San Joaquin train from serving Los Angeles (passengers instead must board Amtrak Thruway Motorcoaches to connect from Bakersfield to Los Angeles). This has been the case since the creation of Amtrak in 1971. An exception is made for the Coast Starlight, which uses the line as a detour if its normal route is closed.
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