The Ertl Model Ts can be assembled at the factory two ways. The easiest version to take apart uses screws. More difficult to take apart are cars that have lugs that are peened over, somewhat like a rivet. To take these apart you have to drill out the peened over lug and separate. Not too easy, and putting the cars back together requires using an adhesive like superglue. If you ever have a choice, go for the screwed version. In the photo the car on the right uses screws. Regards, Dave L.
Sometimes Ertl uses different length screws so I'll ID them by putting the odd one in a piece of paper and mark it. I learned this by trying to put a long screw into a short hole and wondered why it became impossible. Regards, Dave L.