The Bay Area Rapid Transit (BART) board in the US has approved a $479m extension into eastern Contra Costa County of Oakland.
The 10-mile eBART or east Contra Costa BART will extend beyond Pittsburgh to east of Hillcrest Avenue.
The transit system will use Diesel Multiple Unit (DMU) technology. These trains are environmentally friendly, use ultra-low sulphur fuel and meet all applicable US and California air quality standards.
BART's president of board of directors Thomas Blalock said: "One DMU train will carry as many people as 250 cars, greatly reducing greenhouse gas and air pollution emissions."
eBART is a part of $1bn worth of transit expansion projects approved by the board.
Among other projects, the board has approved elements of the funding strategy for the Oakland Airport Connector.
This project is expected to be complete by 2015.