Help With This

For the longest time I have been wanting to add a light in to this freight car or brakevan of my Trackmaster trucks. I know a lot of you guys have done this with locomotives but I wanna try a truck. Preferably one of those little multi colored vans you get with Trackmaster Locomotives. I would like to add a light into the car and have an LED shining out of the rear of it. If any of you know how please let me know, I don't even know if it's doable, so if you know how or have an idea, please let me know. I know that Tramp has done this, and I wanna know if any of you guys can help me, thanks :

  image.jpg (Size: 6.14 KB / Downloads: 75)
This is the car I mean*

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I found this on eBay, u
I do not own this picture