Wikipedia: The Harlem River Bridge of the IRT Third Avenue Line was a double-decked swing railroad bridge that spanned across the Harlem River between Manhattan and the Bronx. It was located between the Third Avenue Bridge and the Willis Avenue Bridge. The upper deck carried the express tracks, the lower one the local tracks and an additional pedestrian walkway. The bridge was torn down after the Third Avenue Line ceased operation between Chatham Square and East 149th Street in the Bronx in 1955. Today no remnants are left.