Hi Jim,
A bit of an update. I have now put Soundtraxx Tsunami DCC and sound into my Niagara. It was partially in pieces when I last wrote but now I have run it extensively. It runs great at the club where we have 6' radius curves but not great at home where I have radius' as sharp as 45". I recommend greater than 49" radius for best results. At the BSMRM it runs like a champ and pulls long passenger trains.
JJ