Hello Forum Family,
Would anyone happen to know the voltage needed to drive Lionel Legacy Conrail GP35 light bulbs? I recently bought a shell, complete with factory installed lights to convert to 2 rail using a brass frame and P&D brass trucks. I want to install a decoder to drive the motor and light bulbs but do not want to blow them up! I am sure they take less than the 10-12 volts the decoder is putting out as they appear to be of the constant voltage variety. Thanks!
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Well, if you told us the Lionel product number, we could answer that question. 
If they're LED, they are bare 3V LED bulbs for headlights and number boards, and 2V LED for red markers. If it's an older Legacy, they're probably 12V incandescent bulbs.
Lionel P/N 6-38539 Conrail GP 35. Lights are intact in the shell, the look to be LED to me?
I have that exact engine, it has LED's. So, they'll be bare LED bulbs, and for a 12V output from the decoder, each LED will want about a 470 ohm resistor in series with the decoder output.
However, some of them are on PCB's with perhaps additional circuitry. I believe the number boards are powered from track power with suitable dropping resistors on this PCB.
John, you are always there with the answers, thanks so much!!! 
And it probably yields more questions. You'll likely have to figure out exactly how the lights are wired on this one as most of them are on the lighting PCB's for many modern Legacy diesels.
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