BART riders should expect delays until about 2:30 p.m. today as construction in the Transbay Tube continues.

BART has shut one of the two tracks in the Transbay Tube to perform maintenance and repair work to electric cables. Construction will continue next weekend, BART spokesman Linton Johnson said.

The repair work means that riders who use the tube to cross the San Francisco Bay could face delays of between 20 and 40 minutes.

While the work is being performed, passengers who are traveling from stations in San Francisco and the Peninsula toward Dublin or Fremont will need to transfer at the 12th Street station in Oakland to a special Dublin- or Fremont-bound train, Johnson said.

BART customers traveling from Fremont or Dublin to San Francisco and the Peninsula should board their normal trains but those trains will be diverted to the MacArthur station in Oakland.

Riders will then have to get off their train at the 12th Street station in Oakland and go downstairs to transfer to a San Francisco-bound train.