[6] The Pelham Line was built as a branch of the Lexington Avenue Line running northeast via 138th Street, Southern Boulevard and Westchester Avenue.

[7] Initially, the extension was served by a shuttle service operating with elevated cars.

Passengers transferred to the shuttle at Hunts Point Avenue.

The center express track is used by the <6> service during weekdays in the peak direction.

St. Lawrence Avenue is the northernmost station on the IRT Pelham Line that does not serve rush-hour express service.