Caboose Marker Light Kit 
Two Red "Pico" LEDs, HO/N Scale, Battery Operated
 
NOTE:
This is NOT a "beginner's" kit.
Soldering, measuring, wire cutting, custom installation REQUIRED.
 
Tiny "Pico" LEDs suitable for HO or N Scale
The kit provides the pieces, it's up to you to install in your caboose. This REQUIRES cutting the wires to fit, drilling holes, soldering, etc.
The switch allows the LED to be turned on and off. To access it without taking the caboose off the base requires drilling a hole to allow you to activate the switch (secured with superglue) with a small screwdriver or toothpick.