Bluelinec4,
Very educational stuff, way back in the 50's the Union Switch and Signal (USS) who invented all the original electronic relay controls advised the NY engineers that all this upgrade work needed to be done, way back then. The original USS is out of business now, purchased by an Italian Firm in 1984, just after my fathers passing and Bill Eanerds retirement from the USS. Lets hope who ever has the contract today does the same kind of incredible high quality job, so Ny can still have the most incredible subway system in the world. Do you happen to know who has that upgrade contract? I would be interested to know. Further the men who invented the original electronic relay controls advised NY engineers to keep & upgrade the electronic relay control engineering package, they did not believe a computer generated control system was safe enough to continually operate trains/subways with, on a longevity basis.
I hope these NY engineers understand what they have just done. The older electronic control system was basically electronic relays, almost fool proof and very safe for those people riding the subways. Safety was the main reason the Electronic relay system was
kept for so many years. It wasn't just the money. I guess we will see what happens in the future, with the new computer generated control system. The old relay system was a hands on, stand alone system, and could not be hacked, not so with a Computer generated control system.
PCRR/Dave