The very first sectional slot track from Scalextric and VIP was molded rubber and folded metal, respectively, but modern slot tracks fall into two main categories: Plastic tracks and Routed tracks. Plastic Tracks are made from the molded plastic commercial track sections. Sectional track is inexpensive and easy to work with and the design of the course can be easily changed. The joints between the sections, however, make a rough running surface, causing the derisive term "clickety-clack track." The many electrical connections cause voltage drop and contribute to more frequent electrical problems. For a permanent setup, the joints can be filled and smoothed, and the power rails soldered together or even replaced with continuous strips, but the surface is seldom as smooth as a good routed track.
Routed Tracks have the entire racecourse made from one or a few pieces of sheet material (traditionally plywood or MDF, but sometimes polymer materials) with the guide-slots and the grooves for the power strips cut directly into the base material using a router or CNC machining. This provides a smooth and consistent surface which is generally preferred for serious competition.
