So you want to build a railroad bridge for your layout. London's Cannon Street Bridge.
(https://scontent-ort2-1.xx.fbcdn.net/v/t1.0-9/152351393_3766042476810178_8417886991687245814_n.jpg?_nc_cat=102&ccb=3&_nc_sid=825194&_nc_ohc=uDHy_FwU7W8AX8KqW5g&_nc_ht=scontent-ort2-1.xx&oh=0f9eba574b73919aa94b2e9ac19efe8d&oe=6054FCB6)
https://www.google.com.br/maps/place/Cannon+Street+Bridge/@51.507788,-0.0954146,650m/data=!3m1!1e3!4m5!3m4!1s0x487603f03e9772d9:0x400c6eb7433457f7!8m2!3d51.5084599!4d-0.0918446 (https://www.google.com.br/maps/place/Cannon+Street+Bridge/@51.507788,-0.0954146,650m/data=!3m1!1e3!4m5!3m4!1s0x487603f03e9772d9:0x400c6eb7433457f7!8m2!3d51.5084599!4d-0.0918446)
Quite a bridge, yard at the time. Looks a lot different today. Strange. Nothing was happening when the photo was taken.
Rich
Holy Shmoly!
Most of this could be built relatively easily using jigs, though the triple frogs in the bottom right would need to be custom built. The real problem would be powering all those switches on a bridge. There is no room for under table motors, or ones on top either. You'd have to use push rods to move the points, and routing them all so they didn't interfere with each other would require careful planning.