Which term describes a structure that carries a railway over an obstacle such as a road or valley?

Which term describes a structure that carries a railway over an obstacle such as a road or valley?

• A. Bridge
• B. Culvert
• C. Tunnel
• D. Viaduct

Answer: (A)

A structure that carries a railway over an obstacle is a bridge. A bridge is built to span over something like a road or a valley, letting trains pass above it. A viaduct is a specific type of bridge made up of many spans across long distances, so it’s related but more specialized. Culverts carry water under or through an obstacle, not over it, and tunnels go through or under rather than across. So the general term that fits this description is bridge.

A structure that carries a railway over an obstacle is a bridge. A bridge is built to span over something like a road or a valley, letting trains pass above it. A viaduct is a specific type of bridge made up of many spans across long distances, so it’s related but more specialized. Culverts carry water under or through an obstacle, not over it, and tunnels go through or under rather than across. So the general term that fits this description is bridge.