When the Yonge subway was being constructed in the early 1950s, the shell of an east-west station for the Queen line, sometimes called Lower Queen, was built under its Queen station, and passenger flows within the station were laid out on the assumption that it would eventually be an interchange. In the 1990s, some of the space was reused for a pedestrian passage when the subway station was being made wheelchair-accessible, but the rest of the station shell remains empty to this day.