By Carlos E. Castañeda A series of delays plagued the Bay Area Rapid Transit system on Thursday morning, including major delays through the Transbay Tube. BART announced at about 9:30 a.m. that there was a delay from San Francisco to the East Bay because of an equipment problem on the track in the Transbay Tube. Minutes later, the delay was characterized as “major” and affected travelers from San Francisco to the East Bay, San Francisco Internat…