FREMONT — With only four weeks left this year, it’s beginning to look like the new Warm Springs/South Fremont BART station isn’t going to open until 2017 despite earlier predictions that the project was on track to open before November after a series of delays.

BART officials acknowledged this week they still can’t nail down an opening date for the new station.

According to agency spokeswoman Alicia Trost, engineers are still testing train control equipment and it’s unclear when that will wrap up.

“Testing is complicated and everything has to test perfect before moving to the next phase,” Trost said in an email. “We cannot easily predict the timing.”

When the testing finally is finished, the project next will slip into a phase known as “pre-revenue operations,” which essentially means running the trains in and out of the station as they would during normal service, minus the passengers. The phase would include final training for BART personnel and emergency responders.

Trost said that phase could last “several more weeks” once started. Although she could not say when the phase would start, Trost said once it does it should be easier for the agency to set a date for opening the station. BART will advise the public when that phase gets underway, she said Tuesday.

“We are working around the clock on this and we are eager to announce a date,” she added.

The extension into Warm Springs began in 2009 with construction of an underground tunnel through Fremont’s Central Park. At the time, the agency said it planned to open the new station in 2014.