Philadelphia (CNN) -- An animated voice crackled over the loudspeaker when the subway train pulled up to the platform at the 15th Street Station.
"Attention all Love Train passengers, this is the Love Train," the voice bellowed, followed by cheers from a rowdy and packed platform.
While the train hissed in place, Krisy Plourde, accompanied by four bridesmaids, made her way down the station's staircase wearing a strapless wedding gown.
Plourde wasn't on her way to the chapel -- she was headed to catch the train, where she would marry Tom Golden inside.
Philadelphia Mayor Michael Nutter married the couple aboard the train's front car. They were officially hitched as they crossed 46th Street in West Philadelphia.
The ceremony was part of the city's Mural Arts Program, the nation's largest mural program. Since 1984, the program has created more than 3,000 murals and works of public art. On weekends throughout the year, a special SEPTA train tours the "Love Letter" series of more than 50 rooftop murals and street signs by artist Stephen Powers that read like love notes.
This was the second Love Train on Valentine's Day weekend since the murals were completed in 2009. Last fall a Canadian couple got engaged during the Love Letter tour. That inspired the Mural Arts program to do something creative for the Valentine's Love Train.
The organizers decided to hold a contest for couples who wanted to get married on the Love Train.
Plourde and Golden applied in the fall and were selected in January.
"I said let's give it a shot, and see if we could be that lucky, never thinking it would happen ever," Plourde said. "This has been incredible, I don't even have words for it anymore. It's amazing."
The couple's original wedding was planned for more than a year from now, Golden said.
"This works out great for me," he said.
Joining the bride and groom were their family and friends, seated or standing holding decorated guardrails.
The newlyweds also shared their special day with a sold out crowd of 350 people taking a narrated tour of the "Love Letter" murals seen best from the special train traveling at 5 mph.
The moment the nuptials ended, applause and screams erupted while the bride and groom embraced for a lengthy kiss.
The couple met on move-in day freshman year at Drexel University, but fell out of touch after graduating. They reconnected in 2008, and it has been a love story ever since.
After the ceremony, Nutter, who was accompanied by his wife to the wedding, gave the groom some advice.
"Best thing for you is to just say yes and you'll be a happy man," the mayor said.
This was one train the pair wasn't changing.
"You wouldn't do it any other way, right?" Tom asked his blushing bride at the window of the first train car.
"Not for a million years," Krisy replied.
"Or with anyone else?" Tom jested
"It's perfect," she said.