Map 2, Draft 2:
(PDF)
Most of the IRT stations have already been labeled.
It's generally not a good idea to split lines between local stations. This necessitates the requirement to run 3 routes over a portion of the line to enable an express or remove express service. Keeping the 2-routes-per-track rule, the Central Park West line would have to carry 5 routes: 2 headed towards Washington Heights and 3 heading towards the Bronx.
I might just extend the Y there as a spur line from the Triboro RX, but it's long enough already (hence it's current terminal at Broadway Junction).
Just like the extremities of northern Queens, I don't think the east side of Bronx will get additional lines. If it does get a line, it would be a spur from the Triboro RX.
City Island may get a subway line, and if so it will probably be and U since they cover the east and west side of Manhattan while the only covers the east side.
I've been wanting to extend the somewhere and it might end up paralleling the several blocks north from Utica Avenue to Euclid Avenue on the Fulton Street line.
I don't even know if it's possible to build a parallel line so close to the water. 14 Street–11 Avenue is already pushing it. If it gets extended, World Trade Center will be the terminal as it's already quite crowded in Lower Manhattan.
See this quote:
But I will see what I can do about 6 Avenue access. The is always a candidate for removal from the Queens Boulevard line. In such a case, I might move the current to the Astoria line replacing the Z. The Z will replace the current V and the will replace the current in Queens and run via 53 Street and the Culver line. The local Culver passengers will get their one-seat ride to Manhattan back, but the Astoria passengers will lose it (instead, having the option of transferring to the: in Queens; the , 8, , and at Court House Square; the at Metropolitan Avenue; and the (, , , , , and U.
The will not go to Manhattan. In fact, we are in short supply of lines that don't go to Manhattan.