This is a Chesapeake & Ohio prototype cantilever signal bridge designed in HO by Earl Hackett and offered here in S without markup for the benefit of C&O S scale modelers. You are free to choose the material of your choice but Smooth FIne Detail is recommended. This has been successfully printed in Frosted Ultra Detail. The upright section and horizontal section fit together precisely and all gusset plates and rivets are very well defined. The Large Cantilevered Walkway is designed to fit on top of this. The maintenance stair and platform is intended to fit under the signal stanchions as well.