Hey guys and gals. I thought I had a running post in here, but it turns out I didnt even have an account - or at least forgot the old one. On to the post! After a few trials, I figured out how to evenly and beautifully light the interior of a passenger cab for cheap (about $2 per car). It's all wired in parallel, so you can add more or higher ohm resistors as needed to adjust individual LED brightness. Heres how I did it. I put a bridge rectifier between the trucks to the capacitor for a constant +/-. From the capacitor I added the resistor (470ohm 1/2w). I may add a diode from the bridge rectifier to the capacitor to keep the heat off the rectifier, but lets see what happens over time. From there, I wired in parallel three 3mm warm white LEDs - you can add more for for individual compartments etc. The LEDs had their culmonators sanded down flat and CA glued to the square light pipes which you can see in the pictures. The bottom of the light pipe which is facing down and angled is sand blasted with 320 grit which makes a nice even glow. The underside of the cab roof I glued tinfoil on so no light escapes, but also all the light is reflected downwards. I also painted the inside floor white as the windows are frosted and theres no interior detail. I added baffles over the entrance points of the wires from the trucks as light shinning down onto the tracks doesn't look right. To do that I used card stock and glued one edge down so the paper lifts and moves as the trucks twist. The overall result is a beautiful illumination that looks like prototypical at night and day. For the porch light on the end car, I added an additional 470ohm 1/4w resistor to make it a little less jarringly bright. Let me know what you guys think of this approach.