Freight service started on September 12, 1910, and the first passenger train crossed the Dumbarton Cut-off on September 25, 1910, although that was a special-event train, as Southern Pacific, the owner of the Cut-off, intended to limit traffic to freight service.
At the time, it was the most expensive bridge structure built in California.
Newark celebrated the start of rail service with a picnic.
Regular passenger service departing Newark was established in 1911; the western terminus was Redwood City, where passengers could connect to the regular San Francisco – San Jose service.

The increased freight service afforded by the Dumbarton Cut-off caused some Hillsborough residents to complain about the black smoke.
The Central California Railway transferred ownership of the entire Dumbarton Cut-off rail line from Niles to Redwood City to the Central Pacific (itself another subsidiary of Southern Pacific) in March 1912.

Some sections of the timber trestles were replaced with precast concrete structures in the 1960s and 1970s.
The last freight train passed over the Dumbarton Cut-off in May 1982.
Freight service started on September 12, 1910, and the first passenger train crossed the Dumbarton Cut-off on September 25, 1910, although that was a special-event train, as Southern Pacific, the owner of the Cut-off, intended to limit traffic to freight service. At the time, it was the most expensive bridge structure built in California. Newark celebrated the start of rail service with a picnic. Regular passenger service departing Newark was established in 1911; the western terminus was Redwood City, where passengers could connect to the regular San Francisco – San Jose service.
The increased freight service afforded by the Dumbarton Cut-off caused some Hillsborough residents to complain about the black smoke. The Central California Railway transferred ownership of the entire Dumbarton Cut-off rail line from Niles to Redwood City to the Central Pacific (itself another subsidiary of Southern Pacific) in March 1912.
Some sections of the timber trestles were replaced with precast concrete structures in the 1960s and 1970s. The last freight train passed over the Dumbarton Cut-off in May 1982.
Dumbarton Rail Bridge