The New York subway is the largest system in the world by number of stations, it runs 24 hours a day, and it is genuinely easy to use — but it assumes four things that most visitors do not know, and every one of them produces a wrong train.
Here they are, in the order they will catch you out.
1. Uptown and downtown, not north and south
Every platform is signed Uptown or Downtown, and in Manhattan those mean north and south. Uptown means toward Harlem and the Bronx. Downtown means toward Lower Manhattan and, usually, on into Brooklyn.
The trap is that at many older stations the two directions have separate street entrances that do not connect underground. If you go down the wrong staircase you cannot cross over; you have to come back up, cross the road, and pay again. The signs at street level say “Uptown only” or “Downtown & Brooklyn” — read them before you go down.
Outside Manhattan the signs use terminal stations instead, which is less intuitive but more honest.
2. Local and express are different trains on the same line
Most trunk lines have four tracks: two local, two express. The local stops at every station. The express skips most of them.
On the map, express stations are white circles and local-only stops are black dots — that is the whole convention and it is not explained anywhere on the map itself.
So on the East Side, the 6 is local and the 4 and 5 are express. On the West Side, the 1 is local and the 2 and 3 are express. On Eighth Avenue, the C is local and the A is express.
Getting this wrong in the helpful direction costs you nothing — you take the local and it is slower. Getting it wrong in the other direction means the express sails past your stop and you end up forty blocks north with an annoyed look on your face. It happens to everybody once.
The letters and numbers are not decoration. Numbered lines are the old IRT and have narrower trains. Lettered lines are the old BMT and IND. They are separate systems that were merged in 1940 and the tunnels are not interchangeable, which is why the map looks the way it does.
3. One platform can serve several lines going to different places
At many stations, two or three services share a track. The A and the C use the same platform, and so do the B and the D, the N, Q, R and W, and the 4, 5 and 6.
They diverge. The A and C run together up Eighth Avenue and split in Brooklyn, and one of them goes somewhere you did not want to go.
Look at the front and side of the train, not at the platform. Every train has an illuminated letter or number on the front and destination signs on the side and inside. The announcements are usually audible and always say the terminus.
4. Weekend service is a different railway
This is the one that breaks visitors’ plans. From Friday night to Monday morning the MTA runs planned maintenance, and lines get rerouted, run express where they are normally local, run local where they are normally express, skip whole sections, or do not run at all. Notices are posted on the platforms and they are not always clear.
Check the MTA app, Citymapper or Google Maps immediately before every weekend journey. Do not trust the wall map. This is the single most useful habit for a weekend visitor.
Paying: OMNY
There is no ticket to buy any more. Tap a contactless bank card, phone or watch at the turnstile. That is it. The fare is deducted per ride.
The important part: OMNY caps the fare automatically. Once you have taken twelve paid rides within a Monday-to-Sunday week using the same card, every further ride that week is free. It is the equivalent of a seven-day pass, and you do not have to decide in advance whether you will use it. Just use the same card or phone every time.
Free transfers between subway and local bus apply within two hours.
If you would rather have a physical card, OMNY cards are sold at station vending machines and in some shops. MetroCards were phased out at the end of 2025.
Children under 44 inches tall ride free, up to three per fare-paying adult.
Practical things nobody tells you
Stand clear of the doors. They do not reopen on a sensor like a lift. They will close on your bag.
Let people off first. New Yorkers are less rude than their reputation but they are extremely intolerant of blocked doorways.
The train is often faster than a taxi in Manhattan between about 8am and 7pm. A crosstown taxi at five in the afternoon is a way to spend money watching a bus.
Stations are hot in summer. Genuinely hot — the trains are air conditioned and the platforms are not, and the difference is brutal in July.
Not all stations are step-free. Roughly a quarter have lifts and they break. Check the accessible station map if that matters.
Late at night, wait in the marked off-peak waiting area near the middle of the platform, where there are cameras and staff, and ride in a carriage with other people in it. The system is safe by any reasonable measure and this is ordinary caution rather than fear.
Eating on the train is legal and normal. Drinking alcohol is not.
The one map fact worth knowing
The subway map is a diagram, not a geographic map, and it distorts Manhattan to make the dense downtown legible. Distances at the top of the map are much longer than they look and distances downtown are much shorter. Twenty blocks is a mile; a crosstown block is about three times a north–south one. If two stations look close together in Lower Manhattan, they are probably a four-minute walk apart and you do not need the train at all.