There are many great references for track sets. You can't beat the 'Elite Redline Guide' for an exhaustive list. For an online guide do checkout Hot Wheels Race Tracks 68-71, it's a blast!
On this site we will do something a little different and show you the stock number and which pieces were introduced with which sets. This can be done since Mattel like to put stock numbers on everything, so we know for certain that the track clamp was introduced with the 6200 Strip Action Set.
The critical component to track sets, produced in industrial quantities, but not marked with the usual Mattel stock numbers.
Standard track lengths are 3", 6", 12", and 24" as shown in the Super-Charger Rally & Freeway Set Instructions.
Wheelie Balancer Track
Wheelie Balancer Track Closeup
Clamp and Track Joiner
Clamp Closeup
Joiner Closeup
Jump Ramp and Loop Base
Jump Ramp Closeup
Loop Base Closeup
Start Gate, Finish Gate, and 2 to 1 Merge Lane
Start Gate Closeup
Finish Gate Closeup
2 to 1 Merge Lane Closeup
Half Curve 14"
Half Curve 14" Closeup
Full Curve, Half Curve 16"
Full Curve Closeup
Half Curve 16" Closeup
Rally Case Stand
Rally Case Stand Closeup
Track Trigger
Track Trigger Closeup
Drag 'Chute Trap and Drag 'Chute
Drag 'Chute Trap Closeup