The New York City subway system is one of the most fascinating networks in a city full of mysteries. Miles of underground track shrouded in darkness, littered with abandoned stations and secret passageways – it’s an object of desire for the urban explorers among us. And, occasionally, New York City acknowledges the delightful mystery surrounding its 24-hour transport system. The annual Holiday Nostalgia train line is a perfect example of this. The train line, consisting of eight vintage New York subway cars from several different eras, runs for a few weekends each year – from the Sunday after Thanksgiving to the end of the year, only on Sundays. It costs the same US$2.75 as any subway ride. Living in the world’s skinniest skyscraper: Steinway Tower, NYC So what did we do? We got on the train and took a ride, of course! This is what it’s like. I got on at the Second Avenue stop in Manhattan – when I snapped these photos in 2016, the train ran between the Second Avenue stop in Manhattan and the Queens Plaza stop in Queens. In 2019, the holiday train is running on the F line uptown starting at the 2nd Avenue station. It makes a handful of stops at major stations along the way – such as Columbus Circle and Herald Square. It stops every two hours from 10am to 4pm. Additionally, the line will run downtown on the D line starting at 145th Street. It stops every two hours from 11am to 5pm. As you can see from 2016’s schedule, the train ran throughout the day starting at 10am and concluding at about 5pm. It is similar in 2019, but there are a few changes. You can also pick the line up at any of the stops it makes along the way. Even though we arrived at 12:30pm, there were already a bunch of people waiting – some were clearly tourists; others were clearly New Yorkers. A lot of people on the train were dressed in period-appropriate clothing. The train arrived about 10 minutes ahead of its 1:03pm departure time – plenty of time for photos. How the 1 per cent live: exploring New York’s richest neighbourhoods There is no running to the train given that no one is using the vintage subway line as if it were an actual subway line. Undergrounds in New York don’t usually stand in a station for longer than a minute or two, but this one stops to pose for photos for at least a few minutes. The same as any other New York subway train, the Holiday Nostalgia line rolls into the station at high speed. Since the vintage subway line runs during the holidays, it’s festooned with Christmas wreaths on the back and front: While the train was stopped, some people dressed anachronistically posed for photos next to the antique train cars: There are some amazing details on these old train cars, such as an old whistle: And these air vents! Soon it was time to take a ride through history. Inside Zayn Malik’s US$10 million New York City apartment Right off the bat, the level of detail is stunning. Old advertisements run through each car: Many of the advertisements on the first train car were from the 1940s, such as this advertisement for war bonds. The “Mighty 7th” war loan ad ran soon after the Allied victory on the Western Front, in May 1945. It’s modelled on the Joe Rosenthal photograph of US soldiers raising an American flag in Iwo Jima. The cars are almost perfectly restored, from the metal “straps” to the yellow-orange seats. The light bulbs have all been replaced, and the ceiling fans are all running. This car was built in 1932 by the American Car and Foundry company, so it has had some wear and tear over the past 80 years. In addition to restoring the lighting and ventilation systems, the The New York City Transit Authority (MTA) also restored the station ID placard. A lot of the fun on these train cars is in the detail. I could not stop looking at every old advertisement, such as this adorable Wrigley’s ad: And this amazingly inexpensive soap. There’s something inherently more upscale about calling it the “City of New York” instead of just New York City, isn’t there? Inside 9 crazy rich celebrities’ New York City homes Nearly 100 years later, the New York subway is still running ads for New Yorkers (and tourists!) to visit Coney Island. Some of the ads are for events long passed, such as this “I Am An American – Citizenship Day” – an apparently free event in Central Park. And yes, Citizenship Day is a real American holiday you’ve probably never heard of (I certainly hadn’t). It takes place on September 17 every year and serves to commemorate the signing of the US Constitution (on September 17, 1787). The holiday was originally called “I Am An American Day”, which was celebrated during the 1940s; it became “Citizenship Day” in the early 1950s. Probably not a bad idea considering America’s history as a nation of immigrants. To the next car! The line keeps the doors between cars open, so you can freely walk through its eight cars: The next car was even older, from 1930, also built by American Car and Foundry. This is not a bathroom; this is for subway operators, despite looking like some sort of nightmare prison: This MTA worker even dressed the part: The sliding doors were far less safe on these early trains. If you got caught in between, it felt as if two metal doors were closing on you. 13 top tips to survive the New York City Marathon Despite the subway car being from the 1930s, advertisements in this car started reflecting the 1960s: This older car looked a bit worse for wear – the metal “straps” were extra worn and the fans were worryingly close to riders’ heads: The seats have clearly been replaced, but they still retain the same charm of their original form: And our friends dressed in vintage clothing made another appearance, classic photography gear in-hand: The next car was far more modern, but that wasn’t because it was built more recently than the other cars. The “straps” were newer, as was the lighting and the seats. This looked the closest to the modern New York subway. And these “modern” destination placards! The subway map looked considerably different back when this train last ran. A peek inside New York area’s exclusive Teterboro Airport These cars ran through the 1970s – some of the riders were discussing when they used to ride on these trains in New York. For the final car, another throwback to the 1930s (although the interior decoration is from the 1940s): Look at this tiny platform he’s standing on: The final car looked more like a train line than the modern subway system: It was full of the same adorably designed seats. And the placards on this one even lit up: My final look into the train was perfectly representative of the bizarre mash-up of antique train cars with modern life: a woman, dressed in antique clothes, listening to music on her smartphone. We arrived at the Queens Plaza stop not long after boarding at Second Avenue in Manhattan. Here’s the Holiday Nostalgia antique train line as it rides away, with one of the many passengers posing for a final picture. The Holiday Nostalgia train line runs every Sunday from 10am to 4pm. It started running on December 1 and ends on December 29. What is Song-Song couple’s Song Hye-kyo doing in New York? Rides cost the same US$2.75 that all subway rides cost, and you can take the train as many times as you’d like. But hurry up because it’s only running for a limited time, after all. And if you miss it, don’t worry too much – the entire subway line is normally on display at the New York Transit Museum. Want more stories like this? Sign up here . Follow STYLE on Facebook , Instagram , YouTube and Twitter . This article originally appeared on Business Insider .