This article was updated at 10:56 a.m.
Regular Caltrain service has resumed this morning after a signal problem in South San Francisco was causing delays of up to 30 minutes earlier today, an agency spokeswoman said.
The problem was reported at about 8:15 a.m. with the signals, which are used to communicate with train engineers, Caltrain spokeswoman Christine Dunn said.
When the signals are not operating correctly, trains must travel slowly, which caused delays to at least two southbound and two northbound trains, Dunn said.
She said shortly after 10:15 a.m. that the problem had been resolved.
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