This map outlines how the newly formed The Boston City Planning Board, began to address the rising demand for commuter rail service in 1914.
Boston already had several subway lines (indicated with narrow red lines) but the board proposed two new underground tracks. One part of this underground system (rendered with a wide blue line) ran from the railroad tracks in the South End (now next to the Turnpike) to North Station, with five stations between Tremont and Hanover Streets.
The wide green line was a proposed tunnel between North and South Stations with a new street above. This was a forerunner of the Central Artery. Nearly a century later, Bostonians are still discussing whether or not to add this rail line as part of the Central Artery Project.
Accompanied report to Massachusetts Public Service Commission on the larger aspects of passenger transportation in metropolitan Boston.