The SMART District provides passenger service on the historic Northwestern Pacific right-of-way, which roughly parallels US Highway 101 and is owned by the SMART District from Healdsburg to Larkspur. There are 24 bridges in the segment from San Rafael to Santa Rosa, as well as 63 at grade crossings (with the possibility of adding more). A positive train control system, as mandated by the FRA for passenger services with grade crossings, was implemented for the length of the service corridor for customer and pedestrian safety.