Well I took some advice from G and tried some. They are LEDs so the board can handle it. I would probably need to add some to each step (front not done), and each truck (rear not done) for a total of nine LEDs on the interior circuit.
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The lighting circuits are rated to handle three 60ma bulbs, and you don't have to run the LED's at the full 20ma rated current anyway. For ground and step lights, I'd probably not want them to be blazing bright anyway, since I don't think that would look right.
I don't see any issue running nine LED's off one of the lighting circuits. When I replace the bulbs with LED's, I use a 330 ohm resistor, I get about a 12ma average current to the LED, and it's plenty bright. The output to the lighting is pulsed DC, so sometimes you may get an odd reading, depending on your meter. For step lights, I'd scale them back even more, probably to only two-three MA for each.
Thanks John.
Those lights that are already in the truck and step position are hooked up to 300 ohm resistors. They are super bright 3mm LEDs. Same ones used in all the other lights on this engine. I just keep changing the resistor value. 180 in the headlights.
I'm sure they'll be plenty bright. 
I'd probably go for 1k or even more for the step lights, they should really just illuminate the steps.
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