Which structure is constructed for the exclusive purpose of carrying railroad traffic across an obstruction?

• A. Airport Runway Bridge
• B. Combined Bridges
• C. Temporary Bridges
• D. Railway Bridge

Answer: (D)

A structure built exclusively to carry railroad traffic across an obstruction is a railway bridge. It’s designed specifically to support heavy, repetitive train loads, keep the track aligned, and provide enough clearance for trains to pass safely over rivers, canyons, or other gaps. This specialization sets it apart from other types: an airport runway bridge serves aircraft, not trains; temporary bridges are meant for short-term use and may not meet long-term railway load and durability requirements; and combined bridges are multi-use structures, not dedicated solely to railway traffic. So the purpose-built answer for carrying trains across an obstacle is the railway bridge.