The HO scale MTH locos, [ K-4 and Triplex] run just fine on D.C., NMRA Compatible DCC and the MTH DCS systems.
MTH is not forcing anybody to purchase a DCS system.
if you have a DCC system that goes to 28 accessory functions, [MRC Prodigy Advance Squared or Wireless], or the Bachman Dynamis System, [has 21 accessory functions] you can really enjoy the sounds of these locos and get the max out of them.
of course on D.C. you are limited as to what sounds you get, but that is the same with all dual mode sound locos on the market today, [athearn, bli, atlas, proto 2000, etc., etc.].
MTH is not forcing anybody to purchase a DCS system.
if you have a DCC system that goes to 28 accessory functions, [MRC Prodigy Advance Squared or Wireless], or the Bachman Dynamis System, [has 21 accessory functions] you can really enjoy the sounds of these locos and get the max out of them.
of course on D.C. you are limited as to what sounds you get, but that is the same with all dual mode sound locos on the market today, [athearn, bli, atlas, proto 2000, etc., etc.].