OAKLAND (KRON) — Looking at rebuilding its aging system, the BART Board of Directors approved a $3.5 billion bond to appear on the November ballot that would help fund the project.

The board originally was considering a $4.5 billion bond.

The bond includes money that will fund replacing tracks, repair tunnels, and replace the train control system. Money will also be set aside to prevent overcrowding at stations.

BART is currently working on replacing its train cars.

More than two-thirds of the BART Board of Directors supported a $3.5 billion bond.

This is the third time BART has asked voters to approve a bond in its 40 years of service. The first time was to start building the BART system, and the second time was for earthquake retrofitting.