2. 42nd Street A/C/E at Port Authority
The reason for the construction of the lower level of the 42nd Street A/C/E line is unknown, especially because it did not run as part of the IND or IRT systems. However, we do know that this track was used for the special Aqueduct Racetrack train between 1959 and 1981. During some time in the 1970s, the line was used for the E train during the evening rush. All entrances to this abandoned track have been completely sealed except for one trap door at the south side of the platform.