Here's a new B div deinterlining plan: (note that new switches would be built between 50th upper and the express tracks)
168th-Lefferts/Rockaways via CPW local, 8th express and Fulton express. Local late nights.
BPB-Euclid via Concourse local, CPW local, 8th express and Fulton local. Weekends to 145th; late nights no service.
179th-WTC via Hillside/QBL local, 53rd, and 8th local at all times.
Norwood (or BPB) - Brighton Beach via Concourse express (rush hours), CPW express, 6th express and Brighton express. Weekends/late nights via local in Bronx.
207th-CI via CPW express, 6th express and so on. Express on CPW all times.
179th-CI via QBL express, 63rd, 6th local and Culver express. Weekends local in Queens; late nights via on Culver and QBL local.
JC-Church via QBL express, 63rd, 6th local and Culver local. Same service pattern at all times.
extended to 18th using center track (new switches added).
rerouted up 2nd; skips 49th.
unchanged.
Astoria-Bay Ridge.
eliminated.
unchanged.
runs on "local" tracks between Essex and Chambers.
Metropolitan-Bay Ridge.
same as .
Is there something that can be done about terminal space on Concourse? BPB is a lousy place to turn trains but it's not like you can fit more at Norwood.