The MBTA reports it's begun work - finally - on systems aimed at curbing the amount of diesel smoke that now pours into Back Bay station's concourse whenever one of its trains pulls into the station.
The first phase, shown above, involves new doorways and air pumps for the stairways to tracks 1 and 2 with the goal of creating a sort of pressurized seal that keeps the diesel smoke from rising up the stairways into the ground-level part of the station. The T says the new system should be in place by early fall.
After that, the T will install large jet-engine like fans to move the fumes out of the station - similar to fans now in place at Forest Hills on the Orange Line. That system is still being designed, the T says.