Mike,
The point isn't the size of the beam or the radius; All I was looking for was a push into the right direction. I was telling you the rest of the information so I didn't get a plethora of answers pointing to patented track or conveyor track.
However, I have found the information I was looking for: Standard Beams can be formed into a curve by beam rolling.
*Beam rolling may be used to form or bend metal beam into curves at specific radiuses, to form arcs and or rings.
*Beam rolling can be done with the flanges facing horizontally, which is often times referred to as beam rolling the "easy-way".
*Beam rolling can also be done with the flanges pointed up or down, this is generally referred to as beam rolling the "hard-way on edge".