BART earlier this month had signaled its intent to exercise the option, adding to its earlier order for 260 new cars, worth $631 million. The total order of 410 cars, worth roughly $896million, is expected to be in revenue service by 2020. BART's Board of Directors approved the $896 million contract May 14.
Additional orders could eventually total 775 cars, Bombardier and BART have both said.
Designated by BART as its "Fleet of the Future", the new cars will replace BART's entire existing fleet and enable system expansion. Bombardier will assemble the cars at its manufacturing plant in Plattsburgh, N.Y.
Bombardier said 10 pilot cars are scheduled to be delivered in the spring of 2015, followed by comprehensive testing of the pilot cars on the BART system. The delivery of the 400 remaining production series cars is expected to follow between early 2017 and the spring of 2020.