Originally Posted by gunrunnerjohn:
The older Williams and Weaver brass typically didn't have sound, but most of the 3rd Rail stuff has QSI and later TMCC and RailSounds. I have a Weaver M1a, no sound, just an electronic reversing unit. Ditto for the Williams K4.
The WEAVER PRR M1a mountain may have been the first engine offered by the manufacturer with a factory installed sound board. {QSI}