Ari floats the idea of a short elevated atop Cambridge Street to complete the fabled Red/Blue connector - an idea currently gathering dust on some state shelf due to its cost.
Key to his plan: A portal, filled in decades ago, that once let trolleys go into a tunnel that ultimately led to another tunnel under the harbor to East Boston: The portal, several blocks past the current Bowdoin station, could probably be easily dug out, and an elevated to Charles would eliminate all the years of digging and trenching and shoring upping and car diverting that the state's tunnel plan would involve, he writes. He adds:
Charles Station could be built to serve the Blue Line with no added mechanical equipment, and minimal changes to the station. There are already wide stairwells, escalators and elevators in Charles Station which bring passengers from street level to the Red Line.