Although the 1914–15 renovation increased the platform area, the narrow stairways to the lower level still impeded passenger flow. The stairway between the lower center platform and the upper northbound platform was replaced with a pair of stairways – one over the other – in a project that was completed in August 1921. Widening of the stairs between the southbound platforms was completed on August 22, 1922. The stairway between the upper southbound platform and the lower northbound platform was doubled in width, with the bottom half split into two sets in opposite directions. That work – partially necessitated by capacity increases in the East Boston Tunnel – was completed on December 24, 1924. Finally, widening of the stairs between the upper northbound platform and the lower southbound platform was completed on May 27, 1925. These improvements reduced the amount of room available on the north ends of the streetcar platforms, and boarding areas were moved south.