Actually, unless the red markers are VERY unusual bulbs, they can be made to work with the ERR stuff, I do it all the time. They're likely LED's on the tender, a resistor and diode with the proper wiring will light them from the headlight circuit. Since the front headlight remains on all the time on steam, I wire them to that output, that allows me to have command control of the markers to turn them off with the lights.
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