In July 1922, the Boston Transit Commission proposed the addition of a side platform adjacent to the outer northbound streetcar track, with a passageway under Tremont Street leading to two new entrances at Temple Place. Opening the Winter Street Concourse to passengers was also proposed, but was soon rejected by the Department of Public Utilities in favor of continued use as storage space for adjacent businesses. A more ambitious 1927 plan by one of the BERy trustees called for new side platforms on both sides of the streetcar level, with a sub-passage connecting the four streetcar platforms, as well as the Temple Place entrances and Winter Street passageway. In 1933, the two stairway headhouses on the east side of Tremont Street were replaced with low walls, as had previously been done at Scollay Square and Adams Square.