Questions that I thought of as a result of the ongoing Red-Blue discussions.
1. How does the capacity of a 6-car Blue Line train with the current fleet compare to a 2-car Green Line Type 10 set?
2. F-Line mentioned
this in June:
Assuming removing Bowdoin and reconstructing State St curve allows Blue Line to use longer trains while still running 6-car sets, how difficult is it to extend all platforms to accommodate for the increase in length of each train set?
The motivation behind these questions is: For whatever possible destinations that have been proposed for a Blue Line Extension beyond Charles/MGH, how feasible is a Green Line branch or another light rail system as a replacement, possibly with grade-separated ROWs?
The main concerns seem to be limited Green Line capacity through Central Subway and the likes, lower capacity per train, and limited potential frequency compared to BLX. The main benefit is that you don't have to build a riverbank subway (thus is feasible even without a Storrow road diet).