quote:Originally posted by Dewey Trogdon:
Matt
Sorry I can't raise the image or grid you mention. My tape measure and the Atlas Dual Bridge width I researched says it won't work for 36" and 40-1/2" Radi curves in the bridge at the end of an 8' wide layout hemmed in by walls.
The "U" is 81" wide which leaves 15" for track-to-wall clearance on two sides which means only minor inches of straight for a bridge in the 081 curve.
It will however work for a Drop Section or homemade much wider "lift" Thru Plate Girder Bridge that will accommodate the wide curve arcs.
There must be some kind of magic that my ancient brain is missing so I will retire from aggravating everyone.
The width of the layout is 96" which leaves 7.5" clearance between the wall and the centerline of the O-81 curves. The bridge only extends about 2" on the outsides of the track centerlines, so there isn't a clearance problem. In the case of the layout design, I added straights, but left 3" of clearance between the track centerlines and the walls/edge of the benchwork and the bridge should still clear with an inch to spare. Now, if the entry point was to be on the 8' side, there'd be a problem as the bridge wouldn't physically fit.
