As we've discussed on here before, one of the big benefits of this project is cutting back a lot of bus routes on the Washington Street section and reallocating those bus hours to increased frequency.
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The routes we truncate or delete outright depends on if the OLX is only going +1 to Roslindale or full West Rox/Milennium Park extension.
If it's just OLX +1 to Roslindale then:
* Cut the 51 bus back to Rozzie, no doubt, frequency is too low and needs the shorter runtime for more frequency.
* Cut the 30 bus back to Rozzie, BUT, also delete the 31 bus outright, since the 31 unnecessarily duplicates the 28 and the 21 buses and the 31 bus prevents the 21 and the 30 buses from being frequent bus routes. If the OL goes to Rozzie Square, then convert the now truncated 30 bus, and take the 21 bus, and convert them to frequent bus routes. Also toss in one more bus for the 28 bus as well for a slight frequency increase. Mattapan riders maintain 1SR access to the Orange Line from Mattapan, or they can take the 21 bus or OL instead to access Forest Hills bus routes, or transfer at JP/Roxbury Crossing/Ruggles for LMA service (or take the 28 if BNRD ever extends the 28 to LMA).
* Cut the 40 and 50 buses back to Rozzie. Their frequencies are too low and need the frequency buff of a shorter route.
* Cut the 34/34E back to Rozzie. Those few minutes saved can up the frequency from every 17-18 minutes to every 15 minutes. We now have a brand new FBR.
* 35/36/37 -> let these routes continue to Forest Hills, it's already a FBR under BNRD and so truncating it doesn't make sense if we don't have enough layover space at Rozzie for all the buses to be truncated, and it's the only FBR meaning the Washington St corridor retains frequent bus service without losing it entirely.
Total brand new FBRs: 21, 30, 34 buses (3 corridors)
Then, if OLX is extended all the way to West Roxbury and Millenium Park, then:
* Eliminate the entirety of the 35/36/37's trunk portion, and replace it with a single combined 35/36/37 route serving the branches only. No more bus service on the 35/36/37 trunk needed anymore.
* Due to the elimination of the 35/36/37, the 42 bus can be extended from Forest Hills to Rozzie Square to cover local Washington St service.
* Take the freed up buses to increase frequency on one of the routes serving Hyde Park and extend the frequent grid some more, whether from Rozzie Square (50 bus), or from Mattapan (24 bus).
Total brand new FBRs: 21, 30, 34 buses + one more corridor (either the 24 or 50 bus)