The 1:43 cars are analog. We(my wife and I) bought the race track at Target a number of years ago now. Carerra has stopped making the SCX brand. They do make 1;43 Digital sets, but its with the GO! type track, not the SCX type of track. The tabs at the end that hold the track together are on opposite sides of each lane, if you try and mix the two. Carerra has not spent a lot of time developing the 1:43 scale. This year, at least, there are no Digital decoders available in their catalogue for converting analog to digital, which I'm very disappointed about. In part this is due to the Spanish tax laws, and financial troubles over there right now. I'd like to make the race track portion of the layout, like a cross between Monaco, and LeMans, with appropriate grandstands, and fences, etc., but Carerra isn't making much in the way of accessories from what I've seen in the catalogue, in 2016.