Don't you guys think that the entire subway system should be upgraded with a uniform cab signalling system? I think it would be the best thing to do instead of trying out various systems on lines such as the 
or the 
. That way there would be interoperability and I think that would eliminate a lot of the today's headaches. I think the MTA needs to find a reliable partner and install one signalling system throughout the whole subway. I know it would be a massive expense, but it would be worth it in the long term.
Any thoughts?