Construction continues on 25th Avenue Grade Separation

Construction continues on 25th Avenue Grade Separation


Work continues on Caltrain’s 25th Avenue Grade Separation Project to improve safety for motorists and pedestrians and reduce local traffic congestion, with the installation of temporary shoring near 31st and 25th Avenues set to begin at night on Monday, November 27. 

Crews will continue installing cast-in-drilled-holes within the Caltrain right-of-way, starting with the pedestrian underpass, then moving to 28th Avenue, Borel Creek, 25th Avenue and 31st Avenue. Typically, crews construct one to two piles per night.

In addition, PG&E will be potholing for the project that may result in temporary closures on Delaware Avenue between 25th Avenue and Pacific Boulevard during the day from 8:30 a.m. to 3:30 p.m.

Caltrain will be single-tracking on the evenings where work is scheduled around 8 p.m. Neighbors may experience construction noise and light during these times and can sign up for a weekly construction notice at

This grade separation project has been a goal of Caltrain and the City of San Mateo for many years. The separation will complete east-west connections at 28th and 31st Avenues, reducing local traffic congestion and increasing safety for drivers and pedestrians. In addition, a new, modernized Hillsdale station is scheduled to open in 2019.

The project, funded by a combination of City, State, High Speed Rail Authority and San Mateo County Measure A funds, is estimated to cost $180 million.


About Caltrain: Owned and operated by the Peninsula Corridor Joint Powers Board, Caltrain provides commuter rail service from San Francisco to San Jose, with limited commute service to Gilroy. Caltrain enjoyed more than five years of consecutive monthly ridership increases, surpassing more than 65,000 average weekday riders. While the Joint Powers Board assumed operating responsibilities for the service in 1992, the railroad celebrated 150 years of continuous passenger service in 2014. Planning for the next 150 years of Peninsula rail service, Caltrain is on pace to electrify the system, reduce diesel emissions by 97 percent by 2040 and add more service to more stations. 

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Media Contact: Dan Lieberman, 650.508.6385