For the past five months, BART has been staffing its yet-to-open Warm Springs Station full time with five $73,609-a-year station agents and an $89,806-a-year train dispatch supervisor — even though no trains will be running there for at least another two months.

Two janitors are also assigned to the empty station. But because it’s pretty clean — what with nobody using it — the custodians typically clock in, then commute in a BART sedan to other stations along the line to finish out their shifts.

It’s the latest twist in the saga of Warm Springs, the station at the southern end of a 5.4-mile extension in Fremont that has been delayed for years by financing and construction issues.

Last year, BART thought it was in the home stretch and penciled in the line to open in November 2016.

BART’s union contract allows employees to sign up for station postings only twice a year — in January and August — and officials felt it was better to be safe than sorry. So they put the Warm Springs Station on the August list.

“Imagine if we were ready to open in November, but didn’t have staff and had to wait until February to open. That would have been poor planning,” said BART spokeswoman Alicia Trost.

As luck would have it, however, there was a software glitch between the extension’s train-tracking system and BART’s 40-plus-year-old main line.

The November opening was scratched, and there’s still no firm new date. The computer problem has been fixed, but the system still needs weeks of testing before trains can start running.

Nonetheless, the BART employees had signed up to work at Warm Springs — so off to Warm Springs they went.

Since September, there have been station agents and a “fore worker” who would manage the dispatching of trains, if there were any trains to dispatch. Someone is there every weekday from 4 a.m. to midnight, and only slightly shorter hours on weekends.

As for what they all do, with no trains and no riders?

“They are helping prep the station for opening, and they are keeping an eye on the station to prevent vandalism, theft and so on,” Trost said.

Emergency: The first prosecution in the police sex scandal involving a teenager who was exploited as a minor went into a tailspin the other day, when the now-19-year-old suffered what prosecutors called a medical emergency on the eve of the trial.

The young woman is at the center of several cases involving officers and sheriff’s deputies from around the Bay Area who allegedly had sex with her — some when she was underage. When she was going by the pseudonym of Celeste Guap, she told The Chronicle that some of the officers paid her and that some tipped her off about prostitution stings.

One of the accused law enforcement workers was former Livermore police Officer Daniel Black, who was charged with having sex with the woman while off duty in his motor home in parking lots in Albany and Berkeley. Alameda County prosecutors said the two had sex after Black took the woman out to dinner and gave her alcohol.

Black’s attorney, Michael Cardoza, said no money was exchanged and that said the woman was not underage at the time.

Prosecutors disagreed — they said the dinners constituted payment. But just as the jury was being selected for Black’s trial on charges including lewd conduct, engaging in prostitution and giving alcohol to a minor, the young woman suffered an undisclosed medical emergency.

It happened while she was going over her testimony with lawyers from the John Burris firm, which is handling lawsuits she has filed against various law enforcement agencies.

No witness — no trial.

Black pleaded no contest to one misdemeanor count of lewd conduct in public, for having sex in the RV.

The entire case will be dismissed in 15 months if Black stays clean.

Last summer, the young woman was sent to a rehab center in Florida for substance abuse and sex addiction. No one is saying what last week’s medical emergency was, but “we are wishing her the best and certainly hope that she recovers,” Burris said.

San Francisco Chronicle columnists Phillip Matier and Andrew Ross appear Sundays, Mondays and Wednesdays. Matier can be seen on the KPIX TV morning and evening news. He can also be heard on KCBS radio Monday through Friday at 7:50 a.m. and 5:50 p.m. Got a tip? Call (415) 777-8815, or email matierandross@sfchronicle.com. Twitter: @matierandross