The simplest way would be the AC - DC convertor, if you don't have a DC power supply. You would just use your switch on the AC to the convertor and adjust it to 4.5 VDC. I run all my buildings and most accessories on DC from a PC power supply that has 12, 5, and 3 VDC taps available. I run my Miller signs with the 5 VDC tap and a diode to get the 4.5 VDC needed.
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