The 4 train is the New York City Subway service whose northern terminal is Woodlawn in the Bronx.
The 4 operates on the IRT Lexington Avenue Line through Manhattan and then continues into the Bronx on the IRT Jerome Avenue Line. Woodlawn is the line’s northern terminal, while its southern service patterns vary depending on operating conditions and scheduled service.
The 4 is commonly grouped with the 5 and 6 because all three use portions of the Lexington Avenue corridor. However, the 4 is distinguished by its Woodlawn terminal and its route through the Jerome Avenue branch. Route numbers identify the older IRT division, while IND and BMT services generally use letters.