Sᴜᴍɪᴛ on Instagram: "Hidden in the dry hills of California lies one of the most brilliant engineering achievements of the 19th century — the Tehachapi Loop, completed in 1876. This massive spiral track was created to help trains climb steep mountain grades that were once impossible for locomotives to scale. The track stretches about 1,200 meters and loops over itself, rising nearly 23 meters in elevation in a single circle — meaning when long trains pass through, the locomotive often crosses abo