janfrederick said:
"The box track IS created from small traingles anyway."
Not a Mechanical Engineer (yet, check back in 1.5 years) but as an aero eng, I can attest that the box (or 4 rail) structure is stronger and needs less suporrt over long distances than the triangular (or 3 rail) structure. Of course they are both advantageous over the flat (or 2 rail) track.
Basically, you can use a little extra steel on the track, or a lot of extra steel on supports.
lata,
jeremy
--who will be starting on his Master's in ME in the fall