The Boston end of the Cambridge tunnel will be completed in the course of a few months. The Cambridge portion of this rapid transit system is already finished except for some small matters which are now being completed. The subway should thus be open by April 1.

The station at Park street which will be one of the most important parts of the new subway, will be 350 feet long and will consist of a middle platform for the passengers going to Cambridge and two platforms for in-bound passengers. It is hoped by thus separating the inbound passengers that a great deal of confusion can be avoided. The middle platform will be 25 feet wide and the two side platforms will be 12 feet wide with two exits on each side leading to the present subway; there will also be exits to the street. A wide stairway will lead from the entrance to the middle platform. Escalators will be used in addition to the stairways to facilitate the handling of large crowds.

Lighting and Ventilation.

A notable feature in the new station is the placing of the electric light wires out of view. Everything will be done, in fact, to make the interior of the stations as attractive and convenient as possible. The ventilation of the Boston end of the tunnel will be accomplished by an immense ventilating shaft which will enter the tunnel just over the westerly end of the Park street platforms.

Route from Boston to Cambridge.

From the entrance of the tunnel at Park street to the exits beyond Harvard square is a little more than three and a half miles. The elevated part of the system begins at the juncture of Grove and Phillips streets, passing over Charles street at an elevation of 15 feet, and then over the Charles river on the West Boston Bridge.

There will be three stations in Cambridge which will be located at Kendall, Central and Harvard squares.

Seventy-Foot Cars.

The cars to be used in the tunnel will be 70 feet long. Five of these cars, which will make up a train, will occupy the same space as seven of those now in general use on any of the street car lines in Boston.