are not counted as separate services. Variants to a different terminal Because of some terminal station capacity constraints, numerous services operate to a secondary terminal as well as their usual terminus during peak hours. Limited rush hour 2 trains operate to and from a different southern terminal (). Limited rush hour 4 trains are extended to and from . Limited rush hour 5 trains operate to and from two different northern terminals ( and ) and two different southern terminals ( and ). Limited rush hour E trains operate to and from a different northern terminal (). Limited rush hour N trains operate from a different northern terminal (). Limited rush hour Q trains operate along different Brooklyn lines in the northbound direction (BMT Sea Beach and Fourth Avenue Lines). One rush hour R train operates to a different northern terminal (). Limited rush hour W trains are extended to and from . Event variants The following lines run in special service or after sporting and other events: The 4 train has a downtown-only express from to after events at Yankee Stadium. The 7 train has a Manhattan-bound "Super Express" from Mets–Willets Point, operating express, and also bypassing Junction Boulevard, Hunters Point Avenue and Vernon Boulevard–Jackson Avenue after New York Mets games weeknights and weekends at Citi Field, as well as after US Open tennis matches. The Holiday Nostalgia Train, which is made up of retired subway cars, runs Sunday mornings and mid-days from Thanksgiving until the Sunday before Christmas. For the 2022 holiday season, the train, signed as the 1 train, travels via IRT trackage between 137th Street and Chambers Street. In previous years, this train, marked as S | Special, ran via IND trackage to Second Avenue, with northern terminals at and 145th Street. Train frequency charts Train intervals The schedule offers trains every 3 to 5 minutes on the most used sections during rush hours. During other traffic periods, intervals range usually from 4 to 12 minutes or up to 20 minutes on outer sections. During late nights, only selected express services are operated and all late-night services usually run every 20 minutes. Trains per hour This is a list of average train frequencies during different times of the day, measured in trains per hour (tph). This chart shows frequencies based on the train intervals listed in timetables, with a margin of error of 2 tph. History