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BART completed temporary track repairs in the tube shortly after 9 a.m. and was able to reopen the Transbay Tube to full service, but trains were running at slow speed. BART officials say they will go back to single tracking after the evening commute to finalize repairs to allow trains to run at full speed.
The accident that spurred the delays happened around 2:35 a.m. when one maintenance vehicle rear-ended the other, damaging 380 feet of the third rail on the Transbay Tube tracks that take trains from San Francisco to the East Bay, BART spokesperson Alicia Trost said.
BART commuters are being encouraged to telecommute if possible, or take other means of transportation.
Stay with ABC7NEWS.COM for updates on this developing story.