It's not done, and it is sort of hard to see at this size, but here is what I have so far.
The main things so far are:
Reorganized Green Line:
I think that if the D Line was made the primary Green Line it would move faster. The B is pitifully slow and the C line seems only a little faster. I don't have a plan for the E at the moment so some feedback would be nice to hear.
I've read other people's outlook on re-establishing the A line. Sounds like that won't ever happen, but oh well, this is all just make-believe. So anyways, yeah.... A line again that branches of the B line at Union Sq. in Allston and loops back at Oak Sq. in Brighton.
C Line is the same. B, and C lines definitely need less stops. Enough years on the B line will drive you mental. I hear a few people saying this and I agree, it should be perfectly reasonable to walk one block to a tram stop.
So to sum it up, they all converge at Kenmore which would be the transfer point to a higher capacity REAL Green Line. Adding another car to the current 2-car setup would seem reasonable enough for this new consolidated "real" Green Line (the old D), as the station platforms currently seem plenty long enough to accommodate such a thing.
But what I am thinking is that at Kenmore, there would be a "hub" in the form of a sort of turn around, not too dissimilar from how the buses at Kenmore operate. I don't know if it would be better above or below ground. One would definitely be cheaper but the other would require car traffic to be altered quite a bit. There are already two outbound tracks and two inbound tracks in Kenmore, maybe they could be altered in a way and tweaked a little to make a sort of underground turnaround.
The last thing is that the in/out bound situation would be very simple (there's nothing more frustrating that having to B's or two C's in a row when you're trying to go outbound a ways).
A inbound becomes B outbound,
B in becomes C out,
C in becomes A out... and so on and so fourth.
This would give more frequency to the kids at BU before it branches off to either Oak Sq. or BC.
So that's my idea for the Green Line. I think it could be done with minimal financial burden as it's more of a reconfiguration, with the exception of new tracks to Oak Sq. from Packard's Corner. and setting up Kenmore for this "hub" of sorts.
I guess it'd be like, "I have to take the green tram to Cleveland Cr. from Kenmore" ....I donno.. green tram.. or somthing.