Tehachapi Pass Train Loop! This is one of the most important engineering marvels in California railroad history. This loop de loop allows locomotive carrying heavy loads to travel from LA to San Francisco. | John Bartell

A southern Pacific heavy mixed freight descends Tehachapi Loop. A set of Santa Fe light engines waits its turn. From the Pentrex show "Cajon Pass & Tehachapi Loop" https://rfd.video/SoCal | Railfan Depot