I have a 4x16 layout with two loops (one over the other)around two 4x8 over-under figure-8s. My question is where can I find more of the eleavtion piers that I am using or ones like it from another manufacturer. They are all approx 5 in wide and 3-1/4 in high and allow one track to run under another one. The upper track does not cross the lower track but is three inches above and on top of the lower track for the entire length. The piers are an upside-down U shape that go over the track. That way I run a passenger loop over a freight loop in the same space. These picures (if I did this right) should help. Just to be on the safe side I better mention that the first picture is courtesy of QVC Inc. <http://home.comcast.net/~zigg72md/t17355.jpg> <http://home.comcast.net/~zigg72md/b3_1_b.jpg> Any/all help is apreciated Thank you.