Assuming you are already running DCS/PS-2 on the A-B-A ----
MTH sells an "Upgrade Kit" (one for diesel and another for steam) to convert to PS-2. They are priced from $150 to $180 depending where you buy it. The Kit contains the control boards, sound board, battery, all new wiring, all new lights, a speaker, and a 40 page step by step manual. To convert a powered (slave) unit should not be too hard, the kits were designed to convert PS-1 locomotives to PS-2. Once installed, you will need to download from the MTH Web Site (free) the proper sound and locomotive software and then download it from your computer to your locomotive. Once done, you would have two independently controlled "A" units that could run alone or, using the "Lashup" command, together.
I have converted five "G Gauge" locomotives made by Aristo-Craft to PS-2 using the kits.
Artisto "G Gauge" RS-3 with DCS/PS-2 added.
Don U. TCA 73-5735
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