on Thu Feb 16 21:36:25 2012, in response to Re: Underbuilt IND?, posted by Edwards! on Thu Feb 16 21:19:11 2012.
I haven't seen any documentation about that but prior to unification, there were supposed to be new IND lines in the Bx to serve the eastern part of the borough which would have been connected to the SAS. After unification, the SAS was to have been connected to both the Pelham Line and the newly acquired Dyre Line which is one of the reasons the Dyre line uses the IND track numbering system instead of the IRT. Although many people aren't aware of this, sometime in the 1970s the MTA altered the Bx SAS plans and opted to leave the Pelham Line with the IRT and instead connect to the Wh Pl Rd Line N/O E180 St which would have all IRT service terminating at E180. Of course with the fiscal crisis of the 1970s, none of these including the full SAS were completed.