Maybe made for an elaborate model train set up, encompassing cars and trucks on roadways, too--I'm not sure, but it made me very happy to find these. Graphite drawn details on some of them, especially the white ones, and some painted details too, including distinguishing two of the yellow trucks as carriers of freight, and a third of mail. I really like them stacked up like building blocks as I have them here--and they pile up very nicely!
Each approx 2 1/8" long. All pictured included.