Nights and weekends

The system never closes, and that is exactly why the map stops being accurate after hours.

Almost every other major metro shuts overnight and does its maintenance in the gap. New York runs twenty-four hours, so maintenance happens while the system is open — on nights and weekends, with trains rerouted around the work.

This is the single largest source of confusion for visitors and a permanent low-grade annoyance for residents.

What changes

• Express trains run local. Very common at night. Your trip gets slower but still works.
• Trains reroute onto another line. A train may run over a different line's tracks for part of its route, skipping its usual stops entirely.
• Some services do not run at all. Several letters and numbers are weekday-only or do not run overnight.
• Stations close in one or both directions while platform work is done.
• Trains run less often. Overnight headways are long — a missed train can mean a twenty-minute wait.

How to plan around it

Check the MTA's service status page immediately before travelling, not the night before. Planned work is posted in advance but changes, and weekend work sometimes extends into Monday morning.

If you are travelling late and the trip is important — a flight, a last train home — plan a bus alternative before you leave. Buses are unaffected by track work and run all night on many routes.

The overnight subway is safe and normal

Riding late is ordinary in New York and most cars have people in them. The practical advice is the usual: ride in a populated car, wait in the designated off-hours waiting area on the platform where one is marked, and be aware that the station attendant booth may be unstaffed.

Late-night alternatives

Night bus service is extensive and reliable. For trips the subway serves badly after hours, checking the bus first is often faster than working out which train is rerouted where.