BostonUrbEx
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The Fitchburg does have room for the 4 tracks necessary up to Union Square. Union Square will be tight though, as the station will require what is essentially the width of 5 or 6 tracks. They have to buy a property or two in order to secure the land for the station there. But other than that, it's a mere slight shift of the commuter rail tracks to the south and the elimination of a freight siding.
I haven't seen any diagrams at all on how the Blue Line would parallel the commuter rail, but it will definitely have it's own two dedicated tracks. My guess is they will run along the eastern side of the commuter rail, requiring the commuter tracks to be shifted west by one "track" from the Saugus River (or from where they join if they go with BRB&L route) to Central Square. The station for Central Square probably has to be elevated over the current station.
I haven't seen any diagrams at all on how the Blue Line would parallel the commuter rail, but it will definitely have it's own two dedicated tracks. My guess is they will run along the eastern side of the commuter rail, requiring the commuter tracks to be shifted west by one "track" from the Saugus River (or from where they join if they go with BRB&L route) to Central Square. The station for Central Square probably has to be elevated over the current station.