DARTMOUTH - South Coast Rail's start will have to wait until safety testing has been fully completed.

Jean Fox, project manager for South Coast Rail-MassDOT, said a start date for "revenue service," meaning the advent of paying customers taking advantage of rail service to Boston, can't be pinpointed yet.

"I don't have it at this time because the testing and commissioning is so robust. We're going to keep targeting and pushing and pushing. It's going to take awhile. That's what it's all about, safety."

Fox provided a South Coast rail update to the Rail to Boston Coalition at the UMass Dartmouth Law School Friday.

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