It's your last chance to take advantage of a New York City holiday tradition -- and no, we’re not talking about the windows at Macy’s.

The MTA’s nostalgia train has been rolling down the city’s subway tracks for the month of December, adding a little holiday old-timiness to the transit system. But this Sunday, Dec. 18, is the final day to catch a ride on the vintage train.

For just a swipe of a MetroCard ($2.75) you can hop on the Shoppers Special and take a trip back in time.

This year’s nostalgia train is made up of eight R1/9 cars, also called City Cars, the MTA said. The cars served lines that are no longer used – including the AA, BB, CC, EE and H. Those lines were active from the 1930s through the 1970s.

“We owe a great deal to these City Cars, because they were durable work horses that remained in our fleet for 40 years. They are the foundation of every subway car we have designed since, and they continue to serve as a reminder of our past and how far we have come in design and customer comfort,” said Wynton Habersham, NYC Transit’s senior vice president of subways. “Our customers love riding these vintage classics every year, and we love showing them off.”

Plop yourself down on a vintage rattan seat and see what it was like to ride the subway in another era, complete with incandescent light bulbs, drop sash-style windows, ceiling fans and roll signs.

The holiday nostalgia train runs along the M line between Second Avenue and Queens Plaza. You can board a nostalgia train at Queens Plaza, 23rd Street-Ely Avenue, Lexington Avenue-53rd Street, Fifth Avenue-53rd Street, 47th-50th streets-Rockefeller Center, Broadway-Lafayette Street, 42nd Street-Bryant Park, 34th Street-Herald Square, 23rd Street-Sixth Avenue, 14th Street-Sixth Avenue, West Fourth Street-Washington Square and Second Avenue. For more information on train times, click here