Stand clear of the closing gender gap – the W train has arrived.

Sally Librera will start as the MTA’s first female head of subways on Monday, overseeing all aspects of the embattled transit system.

“This is a critical time for subways and we need to be looking at every aspect of our operation and challenging convention across the board,” said Librera, who will make $234,000 a year.

“Part of questioning everything we do involves making that conversation as inclusive as possible – involving as many diverse perspectives as possible.”

Her appointment is part of a larger organizational shift by new NYC Transit President Andy Byford, who turned one job overseeing the subways into three, with Librera at the helm as the senior VP for subways.

Frank Jecyzki will report to her as executive VP and chief operating officer for the subways – handling the day-to-day functions of the sprawling system. Another exec under Librera who’s yet to be named will oversee stations, customer service and “front of house” issues, Byford said.

The transit president prioritized elevating more MTA women.

“You just get way better decisions if you have women – and for that matter, people of color – on your executive team, rather than if you just have a team of clones of white men,” Byford said.

Librera first joined the MTA in 2004 and last year she was the first woman chosen to lead the Staten Island Railway, which has seen a bump in on-time performance in the last 12 months.

So will more subways run on time with a woman’s touch?

“The entire gender is really counting on my answer,” Librera answered with a hearty laugh. “Trains are going to run on time.”