One of the things that always annoyed me about the M-7's was the excessively noisy door opening/closing machinery at least on LIRR's cars. I assume M-N's M-7A's have the same problem and I've wondered if the M-9's will also have noisy doors.
And this week I took my belated first ride on the New Haven Line's new M-8 cars and was surprised to note that the doors opened and closed quietly, like the double-leaf doors on the older M-series cars.
So has door machinery improved since the M-7's were built or does Kawasaki just build a better product than Bombardier? Or did MTA maybe get enough complaints from the public about the noisy M-7 doors that they specifically spec'd something better on the more recent orders?