this is the southernmost 3-track station on the line. south of the station, there are switches that connect the express track to either local track, with trains then being able to crossover to the rising express tracks from the irt lenox avenue line. under 103rd street, the dual express tracks serving the southern part of the line descend and curve to the east to form the irt lenox avenue line. they turn off of broadway and onto 104th street directly underneath this station. an emergency exit from the lenox avenue line is located in the middle of the northbound platform.