The Tehachapi Loop is a famous railroad engineering marvel located in the Sierra Nevada mountains of California. It is part of the Tehachapi Pass, where trains ascend a steep grade by looping over themselves. This unique design allows trains to gain elevation while minimizing the steepness of the track. Constructed in the late 19th century, the loop is approximately 0.73 miles long and features a 360-degree curve. It is a key part of the Southern Pacific Railroad route, connecting the San Joaquin Valley to Southern California. The loop remains a popular spot for train enthusiasts and tourists alike.