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An arched outline or a suspended bar over a track.
Also known as: Gauge marker, Loading gauge, Clearance gauge, Arch over a track
A loading gauge is the maximum cross-section a vehicle may occupy, and the physical marker — a suspended bar or an arched frame — is a go/no-go test: anything that touches it will hit something on the line. Gauges differ between countries, which is why through-running needs the smallest common one.
Denotes the maximum permitted cross-sectional profile for rail vehicles on a route.
Contexts: Public information
Is physically checked with a suspended bar or arched frame, a load touching it being one that will foul structures on the line.
Contexts: Public information
Differs substantially between networks — the British gauge is among the most restrictive in Europe — which is what limits international through-running.
Contexts: Public information
An arched or rectangular outline frame spanning the track at a fixed height, or a horizontal bar suspended above a siding entrance.