As per yesterday my track lighting lost control of its variable dimmer adjustment off the switch.? It still goes on and off but I have no dimmer control.

The switch is a simple lever switch for variable control.

Would this be the switch, track light, or??

It's the Dimmer, when replacing, be sure the total wattage of the bulbs, don't exceed the wattage of the dimmer.

When replacing dimmers, or any type of electronic control, be sure to read and follow the instructions carefully.

Most, if not all, explain that the power to the switch must be off, do not connect live.

Thanks it was certainly was the dimmer...