How did a cutting edge railroad become crumbling tunnels to nowhere? This week, the story of the Mountain Route, a long lost rail line that once cut through the Santa Cruz Mountains. In it's heyday, the line provided an easy way for Bay Area residents to get to the beaches of Santa Cruz.

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Reported by Peter Arcuni. Bay Curious is made by Katrina Schwartz, Suzie Racho and Katie McMurran. Additional support from Erika Aguilar, Jessica Placzek, Kyana Moghadam, Paul Lancour, Carly Severn, Ethan Lindsey, Vinnee Tong and Don Clyde.