Linked from
The 9 pages that link to Railway bridge, each with the reason it gives.
BridgeBroader topic: Railway bridges must accommodate heavy, moving loads and track constraints.
Truss bridgeRelated: Truss bridges have carried heavy train loads across long spans.
DrawbridgeRelated: Some navigable waterways use movable railway spans to preserve vessel clearance.
Trestle bridgeRelated: Trestles have long supported railways across valleys, rivers, and marshland.