Marc A. Hermann / MTA New York City Transit

A marriage proposal in an unfinished New York City subway station may not be the stuff fairy-tale wedding dreams are made of for most, but for a pair of self-professed "transit nerds" it was just perfect.

"I think it was genius," said Carolyn Grossman, 31, who became engaged to her boyfriend, Adam Meagher, on Saturday in the city's unfinished Second Ave. subway stop.

Meagher, 35, a vice president at New York City's Economic Development Corporation, tried many months ago to arrange for him and Grossman to take a tour of the Second Ave. stop, which won't be completed until December 2016.

Grossman, who works in the city's Planning Department, grew up in an Upper East Side apartment building directly above the much-anticipated subway stop, where her parents still live.

"Adam apparently called the MTA [Manhattan Transit Authority] saying, 'We're planners we and love transit and can we go on the tour,' and they said, 'No,'" Grossman said. "Then he said, 'My girlfriend's parents live in the building above, does that get on this tour?,' and they said, 'No,' again.

"Then he said, 'I have this crazy plan to propose to my girlfriend there,' and I guess the romantics in the MTA helped him from there," said Grossman, who now lives with Meagher in Brooklyn.

In the middle of the public tour Saturday, in front of a group of roughly 30 people that included Grossman's parents, , Meagher got down on one knee, "in the mud," according to Grossman, and proposed.

"I know I mumbled something like, '100 percent yes,' and that's about all I remember," Grossman said.

Though Grossman and Meagher have been dating for three years and had discussed engagement, Grossman says she missed many clues during the proposal planning, mostly because Grossman is such a transit fan.

"I can't even count the number of times he said he was so excited for the tour," Grossman said of her fiance. "Because he's such a transit nerd, I just accepted at face value that he was really that excited about a transit tour."

The pair hasn't started planning their wedding but Grossman says if the MTA "romantics" come calling, they might have a subway wedding too.

"If the MTA wants to let us have our ceremony in another underutilized transit station we'll take them up on it, but we'll probably do something more traditional," Grossman said. "We haven't even begun to plan."