Obviously we're talking about a DCS command-control environment with ~18V on the track. I'd think anyone operating incandescent cars would have to do something about the excessive brightness since traditional cars weren't designed for command control voltages. I guess some guys get lucky and find 18V or 24V bulbs and swap them in if practical. Others use the "trick" of inserting a 5 cent diode so bulbs receive on only half of the AC cycle thus cutting brightness about in half when running on a command control layouts. Of course inserting a diode is an equivalent effort/modification to inserting the 100uH inductor/choke!
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