The Iron Horse Regional Trail runs more than 30 miles through the San Ramon Valley. But many folks who walk or ride their bikes along this paved path may not know it used to be a railroad line. This week, reporter Amy Mayer rides the rails through locomotive history in the San Ramon Valley to learn how the trains may have shaped the surrounding cities.

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This story was reported by Amy Mayer. Bay Curious is made by Olivia Allen-Price, Amanda Font, Christopher Beale and Brendan Willard. Additional support from Cesar Saldana, Jen Chien, Katie Sprenger, Jasmine Garnett, Carly Severn, Jenny Pritchett and Holly Kernan.