I've been toying around with the idea adding Christmas lights to my Holiday cars and this is what I came up with.
The Tanker is a Lionel 6-81986 Santas Christmas Magic Tanker and the box car is a Lionel Holiday Boxcar I had laying around. Unsure of the part number.
I couldn't find a pick up for the trucks on these cars so I modified one to fit, though not perfectly, but works for now. And used a custom Alternating Quick Flash circuit by Evans Design, with red and green led chips. What do you think?