Hi Jim n Rose, my trestle is straight as my hair Did not curve it. The second picture posted is a trestle built by Shamus. You can purchase a plastic curved trestle bridge. i wouldn't advise anyone to try and build a curve one out of a straight one. But to curve the plastic i would use a hairblower for heat and a jig to mold it into. The hairblower works good in softening up the plastic on gondola cars to put dents in. i mold the dents with my finger. Hi Shamus, thanks for the info on the water. i will be trying it, but i think i will practice first. Me and water falls don't get along. i can do rivers, slews, harbors and bogs but not water falls.