Concrete Double Track Bridge 2 Solid Supports N 1/160. Solid supports used near the ends of the bridges. The parts are sprued together to be separated by the end user. Based on the Gunpowder and Bush River Amtrak catenary Bridges in Maryland. There are several modular parts to choose from to make the bridge the size you want.
See all modular bridge parts here:
https://www.shapeways.com/shops/bonevalley?section=N+Concrete+Double+Catenary&s=0
For more information, including measurements, go here:
https://bonevalleymodeler.blogspot.com/2023/08/modular-concrete-double-track-bridge.html