There's a socket on the CV board with a dropping resistor for marker/class lights if the unit is equipped with them. They can, as George says, also be connected to the output on the PS/1 board, the yellow connector. Easy way to find out, trace the wires from the spring contacts on the frame to where they go. I'd guess the PS/1 board for this one as I don't believe that particular lighting board has the LED driver socket, the ones I have are all either MARS, headlights, or cab lights/number board outputs. All the bulbs are 6V.
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