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Actually, many MTH locomotives have only one control for lighting, and it's not uncommon to see the cab light wired to the headlight circuit.  If this is a model with a mux board, then it would be likely to be separately controlled.

I think I just cracked the code!  Your locomotive has a front electrocoupler, so they used up the extra control channel for the coupler.  I think you're going to find that's the way it works.

Well, the Lionel IR link is a totally different animal.  It is only a one-way link, from the locomotive to the tender.  However, being a digital serial communications link, you can carry multiple commands to the tender.  Coupler, backup light, marker lights, sounds, etc.

MTH PS/3 has a serial communication link between the locomotive and tender, so control of a lot of extra stuff in the locomotive is easily accomplished with PS/3 steam.

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