At Donner Pass the Lincoln Highway (1913-1927) did not cross the railroad at grade for long. In 1914 an auto subway opened under the Southern Pacific snowsheds so cars could pass under the rails instead of through them.
This walk reaches that underpass, often called California's first railroad underpass built for automobiles. It carried the road until the 1926 bridge moved traffic onto a new alignment. Same rocks. Same pass. Old emigrant trail still underfoot.
Would you have driven under those trains in 1914?