A region of great agricultural bounty, the valleys that surround the historic town of Healdsburg are known for a fair number of different crops. But for half a century, the prune industry— from plum trees, to packing plants— dominated the local economy.

There was once a high-speed, interconnected network that helped to put Petaluma on the map. But it wasn’t the Internet! Rather, it was the railroads that once criss-crossed early Petaluma and all of Sonoma County.