Digitrax have a wireless throttle, but it is wireless only between the throttle and the DCC command station - there are still wires (but only 2!) from the command station to the rails.I think there is an infrared system available with the command link directly between the handheld and the locomotive receiver. Rail-Lynx or Locolinx, maybe? It was reviewed in MR a few years back, and I think it's still advertised (look for the guy with the cigar and the top hat in the ads!). DCC seemed a better way to me, so that's the way I went.
That's all I know. Hope it helps.
B-Dubya
------------------
Bentnose Willie
Maitland, NS CANADA
-------------------
Love my MLWs!