I would also consider the PFM type sound systems as DC since pure DC is used to power the motor and they need the same block system as a DC non-sound layout. The sound (audio frequencies) and chuff sync (RF) also go through the rails so sometimes they are referred to as sound-through-rails systems. PBL and Grizzly Mountain Engineering (GME) also made these type of systems. For those of you who visited Bob Hogan's layout during the recent NASG convention, he had several of the PBL systems and was using them to run his trains with sound. There were some circuits in an old MR to build your own system, which I did about 30 years ago, before I switched to analog command control and later DCC.
Dave Heine Easton, PA From: [email protected] [mailto:[email protected]] On Behalf Of Pieter Roos Sent: Friday, August 24, 2012 12:14 PM To: [email protected] Subject: Re: {S-Scale List} It is all my fault Hi James; I'm assuming you mean DCC sound, since there are no real "systems" for sound under straight DC (although some DCC sound decoders will produce a minimal subset of sounds under DC). In HO, Mike's Train House offers trains with their proprietary control system which will operate under DCC. So sound systems are somewhat compatible between DCC and DCS (the MTH system). I don't see why Mike's would abandon this for SHS trains. This leaves Lionel as the outlier, but they have already discussed adding some level of DCC compatibility. For that matter, Lionel TMCC/Legacy and MTH DCS are control systems similar in concept to DCC, just proprietary rather than a common standard as DCC is. It isn't quite like going back to Lionel/Gilbert AC with the forward/neutral/reverse sequence. Pieter E. Roos <http://geo.yahoo.com/serv?s=97476590/grpId=252190/grpspId=1705346731/msgId= 89211/stime=1345824860>
