Lockons allow you to attach power to the track. This version works on both standard gauge and O gauge track. Made between 1936 and 1942 only, it is a universal, fiber clip-on device with two working terminals and two way locking lever clamps. This example comes with six connecting ties for O27 track, the tube of lube, and the rare, original box, which is the real prize here! Box has both tuck in flaps on ends detatched, but one is present. Great for the box collector!