125th Street is a station on the IRT Broadway-Seventh Avenue Line of the New York City Subway. Located at the intersection of 125th Street and Broadway, where Morningside Heights meets Harlem, it is served by the 1 train at all times. It is the only station on the short elevated Manhattan Valley Viaduct, which bridges the Manhattan Valley from 122nd to 135th Streets. The viaduct allows the trains to remain relatively level while traversing the valley. Stairs and escalators lead to a mezzanine under the tracks that allows access to both uptown and downtown trains from either side of Broadway.