I don't know if this was discussed on here before, so I'm putting this out here for discussion. A couple of my friends were discussing about the problems that occur when the B terminates at 145 during the mid-day. Consider this scenario: if there was a B in the middle track at 145, that B would have to wait until a southbound D clears 145 to leave. At the same time, there is a northbound B at 135 waiting to enter 145 and a northbound C at 125 which has to wait for that B to leave as well as a northbound D. Once the southbound B leaves 145, then the northbound B can enter 145, but the northbound D has to wait at 135 and an A behind the D has to wait at 125. This could create a lot of tie-ups.
Also in addition, if a southbound B is leaving the middle track at 145, a southbound D can't enter the station until the B has left. One solution is to extend the B to Bedford Park outside of rush hours. There would be less conflicts and delays.
Any thoughts, please feel free to comment!