The O Gauge 3-Rail Lionel 6-36787 MofW Maintenance of Way Searchlight Car #16685 is a ready-to-go pre-built model made of plastic, measuring 10 inches in length. This searchlight car is factory painted and comes in its original box with included paperwork. With a scale of 1:48 and plastic trucks/metal wheels, this Lionel brand train car is designed for use on a three-rail system and is graded as C-7 Excellent.
Interesting concept in that it is actually "programmable" and you can control the speed of the revolution and the brightness of the light, although it takes a little time to understand the programming process. All in all, a neat accessory (I have attached it to the back of a length of army flatbeds.)