I don't have sources available on my phone, but I believe it is something they are actively working on. The problem is it's just so much more expensive, takes a long time, and doesn't affect public opinion as much.
The Wikipedia article "Signaling of the NYC Subway" has a lot of information.
i know they are working on this. but as a member of the subway-riding public, far and away the number 1 thing I have a strong opinion about is delays, which almost always are blamed on "signal problems"
I agree. Problem is the general public is even less informed than the people commenting on this article. They'll probably just think it's a waste of money.
The Wikipedia article "Signaling of the NYC Subway" has a lot of information.