The Petaluma waterfront at night. This stretch of the Petaluma River is the northernmost navigable waterway on the San Francisco Bay. The old rails in the foreground are the southernmost extension of the old, abandoned Petaluma and Santa Rosa Railroad. Cargo and passengers could debark from a steam boat and continue their journey by electric train all the way to Santa Rosa and even Forestville back in the 1920s. Sadly, by 1933, the automobile had killed both modes of transportation.