In 2019, SMART released a study on the possibility of extending service along SMART (formerly NWP) owned and operated freight tracks between Ignacio and Schellville (near Sonoma), into Napa or Solano counties. Funding for the study was provided by the state in response to chronic flooding along the State Route 37 corridor. Not being member counties of the Sonoma–Marin Area Rail Transit District, a new funding mechanism would have to be established before service commenced. This line would allow the train to connect with the passenger ferry in Vallejo or the Amtrak station in Suisun City. , planners expect this rail link to be reactivated for service after 2040, and the 2019 study expected construction time between four and six years. Estimated at $1 billion, work on this link would not begin until after the initial 70-mile system was operational.