The Tehachapi Loop is an iconic spiral loop, 1.17 km long, that passes over itself as it gains height on the railroad main line through Tehachapi Pass, in south central California. The loop was constructed in the latter half of the 19th century as part of Southern Pacific's main line through southern California, which had to cross the Tehachapi Mountain range. More than 3,000 Chinese immigrant laborers toiled for two years cutting through the solid granite with blasting powder, and then clearing the debris using picks, shovels, and horse drawn carts, to lay the Tehachapi Pass Railroad Line. The line, which climbs out of the San Joaquin Valley and through the Tehachapi Mountains to Mojave in the Antelope Valley, was part of the last and final link of the first railroad line connecting San Francisco to Los Angeles.
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