My favorite is PFM from the late 1970 early 1980. This is steam only. The PBL does diesel.
http://cgi.ebay.com/PFM-SD-S-Radio-Control-Sound-System-MIB_W0QQitemZ350175127687QQihZ022QQcategoryZ485QQssPageNameZWD1VQQrdZ1QQcmdZViewItemQQ_trksidZp1638Q2em118Q2el1247
If you want to stay in DC operation, what is the best sound decoders or sytems to install in both diesels and steam locos. What equipment/accessories are needed to operate sound in DC operation?
Appreciate your advice, thanks in advance.
Dave