Non-motorized tracks for lights

[Wickedjester2]

Hello! I'm looking for some heavy duty tracks that I can put my lights on so I can manually move them back and forth. I don't want anything motorized - I'm just looking for something that I can move the lights back and forth by hand when I want (obviously, moving them will not be a daily thing). My lights weigh about 50 lbs so they need to be pretty heavy duty.

Can anyone give me recommendations on where I can find tracks like the above? Thanks!