Will DCC control O gauge, and if so is it possible to change the decoder in my 2 Lionel loco's so they will operate on a DCC system?
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No, Only MTH has DCC capability in PS-3 Locos right now. There may be decoders available, but you would have to convert the engines and they would have to be DC can motor engines, not AC Pulmore motors. G
DCC is "gauge agnostic" to use a phrase from an earlier thread. You just have to find a suitable decoder...which are typically rated in Amps of DC-motor drive capability which can be a bit off-putting to the O-gauge crowd. While commonly associated with HO, after-market DCC decoders are commonly used for larger G-arden gauge engines so the electrical capability to drive O-gauge motors is definitely out there.
A possible hassle is finding an off-the-shelf decoder to control non-motor functions under DCC if your engine has them...lighting, synchronized smoke/sound, etc..
