I have acquired a Lionel Alco PA that is equipped with TMCC and Signal Sounds. I believe it may have been the second A unit with the RailSounds in the other A unit or possibly the B unit of an ABA set. Be that as it may, I would like to install an ERR RailSounds in it. My problem is where to tap in to the serial data in the Lionel TMCC board. Has anyone done that or something similar? Any help would be appreciated.