Is there a reason besides money why we cant install glass doors at station platforms to keep heat or a/c within the stations like other subways do? I notice we dont do this in America, but overseas this is done to keep from pumping heat or air down the tunnels. Seems like it would save a lot of money over time. I know part of it has to do with aligning to the doors the right way but that cant be hard. I know the MBTA is broke but maybe if its seen as a cost saver we could be the first? Why isnt it done anywhere in America besides like airport monorails and stuff like that? I know its a longshot but it could save money and make stations MUCH more comfortable in the summer.
I believe you need automated self driving trains for these types of doors, and while you do mention this would save costs in lost heat, it will be extremely expensive to get proper duct work down to the platforms for cool and warm air.
The MBTA is conducting a study on them. It seems like fluff to me, and if I remember correctly, they are focused more on safety and efficiently moving people in and out of the trains, so with that wording, you may not see a full enclosure that would accommodate for proper A/C and ventilation.