On July 2, one week after Esmy Valdez and Daniel Jean’s Brooklyn wedding, Mr. Jean told his wife to change into another white dress before heading to the Canarsie-Rockaway Parkway L train stop.

With the help of his friends, Mr. Jean, 40, a comedian, had decked out one of the subway cars with a folding table, streamers, balloons and sunflowers — Ms. Valdez’s favorite.

While on board the train, the couple enjoyed a low-cost public wedding reception complete with a five-tier wedding cake, musical instruments, catered dishes, an emcee and an assortment of enthusiastic friends and strangers.

“We even did the bouquet toss and people were involved in it,” said Ms. Valdez, 39, who works in social media marketing and credit consulting. She noted that two commuters who were not invited guests ended up calling off work to continue celebrating with them. “People were just really, really happy,” she said.

While the Metropolitan Transportation Authority does not explicitly prohibit weddings or wedding receptions on the train, celebrants should be mindful that the organization does prohibit large gatherings that obstruct the flow of traffic or interfere with the safe operation of the subway.

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