American Models Woodside Caboose
 Lighting Modification
Block Light Bleed Through and Reduce Bulb Intensity for TMCC
Authored and Photos by David Horn
Edited by Carl Tuveson

Before on the left  and After on the right.

 To reduce how brightly they light up and glow-through, especially when run with TMCC engines (i.e. run at a relatively high constant voltage), I've previously painted the interiors of cabooses flat black to achieve similar results, but this duct tape technique
works as well and is really easy (i.e. a one or two evening process). I'm very pleased with the results. A caboose with these modifications looks good during the day (I.e. you can still tell it is an illuminated caboose) and at night (i.e. it doesn't glow like a red light bulb).
There's only one material needed - - aluminum (shiny, bendable) duct tape. Tools to have on hand include an X-acto knife (for cutting out windows and trimming tape), utility knife (for major tape removal cuts), scissors, tweezers (to position the tape), and a popsicle stick with one end broken off or cut off square (to rub the duct tape tight to the interior surfaces of the caboose).

.Hope this helps you and others.... ,Dave

Click on pictures for larger view.

To disassemble the caboose remove the 4 screws from the bottom and the top slides out of the body.
Ceiling edge strips which are strips of tape (about ½" wide) folded in half lengthwise then applied to the inside edge of the ceiling to prevent light from coming out along them (left and right sides).
You might also notice that I opted not to cut out the entire area leading up into the cupola, but instead I removed only the "aisle-way". In fact, I ran a strip of tape on either side where each seat would be located to reinforce that effect. It turned out pretty neat. I
The foil is applied to a  side and then trimmed
Then trim the window openings with an
 X-acto knife.
You need to rub the tape tight onto the interior surfaces and seams to remove air bubbles because the roof and "glass" insert of the caboose needs to fit back in when you're done. 
The bulbs wired in series burn at a much more reasonable level, especially at TMCC levels of power, than when in parallel as originally configured. You can opt to modify the board or simply remove one lead from each bulb and connect with a wire like the photo shows.