Mechanical problems on Caltrain were continuing to cause delays Monday on northbound trains, spokeswoman Christine Dunn said. As of about 7:50 a.m., the No. 319 train was seven minutes late approaching Burlingame. The No. 313 train was eight minutes late approaching San Francisco. The No. 217 train was 11 minutes late at Palo Alto, and the No. 211 train was 17 minutes late approaching Bayshore, she said. The only southbound train with delays is the No. 210, which was six minutes late at San Antonio.