This Handheld and TIU cost about $260.00 on ebay.
It would be best to check out this MTH link for all the functionality of the system. The Handheld has upgradeable software that can be downloaded from the MTH website.
There is a lot to read here.
In short, it's another system to chose from like DCC, Scale Command [Lionels TMCC], LGB's MTS, Locolinc, RCS, etc. In the Ogauge world - about 25-30% of them use some type of remote control function that let's your control up to 99 or more locomotives at once. There are various options available in DCS like sound, uncoupling, smoke control, mu'ing, etc.
Most of the Ogauge world runs TMCC and DCS [DCS can control TMCC but TMCC cannot control DCS]. Both TMCC and DCS offer an incredible amount of functionality but the downside is that the locomotives tend to be more like miniature computers. Lionel has wisely licensed TMCC to several other Ogauge Train Manufacturers but they haven't upgraded their basic system much in the last 8 years. And the MTH system DOES control the TMCC locomotives so you can get buy running your favorite Lionel, K-Line, Weaver and MTH engine using DCS to operate the Command control functions.
And as stated, most of the Ogauge offerings come with the Sound cards/system boards already IN the engine. Hence - the Gauge 1 Hudson has most of the workings [less the proto coupler - remote control coupler] that the Ogauge engines have BUT, as stated, you need a MTH Handheld unit and the Track Interface Unit to run ALL the functions. You can run an MTH loco with DC or AC power but you do NOT have to have an AC power source to run the DCS system. The local store that has a Hudson hooked up and running DCS uses a Bridgewerks DC power transformer. The power is lead is hooked up directly to the DC power lead and into the T.I.U. The power then comes out from the TIU and hooks up to the 2 Rail Large Scale track [as seen in the photo above]. This was also shown at the most recent ECLSTS in York. Andy Edelmann of MTH did a presentation about all the features and functions of the DCS system. The Bridgewerks power supply was used [DC power]. They even had an LGB engine on the track. This was actually controlled using the DCS handheld in a conventional mode.
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