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On my F-7s, I use some clear plastic tube to fill the headlight hole. I drilled holes to hold the lights. TRhe lights are in series with the motor. I polished the outer end using brass polish on demin. When the lights alternate, it looks like the Mars flasher. The cheap diodes 1n4001 have a 1.2v drop so if you parallel light the diode handles the current and pegs the light voltage. If you use a bridge you get directional lighting and it starts when you put more than 1and a half volts on the locomotive. I use a 20 watt light in the cabbose as a thyristor to protect lights. So you can use lights or LEDs. There are plenty of references to these diode ciircuits and they are simple. Lindsay
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