How do i achieve pic 4 from pics 1, 2, 3? I see where the light source (to the right of the red marrette) is but not sure if tying it in to that will work. i unplugged the and touched LED string ends to the pins - yes lit up, however the diode got really hot - hot to the touch.

any help, advice, etc etc.

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Pretty hard not knowing what the LED string he's using is rated at.  That would be the first information we'd need to make any suggestions.  Since it's a PS/1 locomotive, I'd just design it to run on track power.

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