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[General] Bridge terminology



If a bridge carries a railway OVER a road, watercourse etc, it's an
UNDERBRIDGE. If it carries a road etc over the railway, it's an OVERBRIDGE.
What about a bridge which carries on railway over another, e.g. Botany Line
over Illawarra at Sydenham (NSW) and Long Cove Viaduct (NSW western line)???
Is it an overbridge on the lower line and an underbridge on the higher??

Rgds

Ron Besdansky
(Computer system project manager and rail enthusiast)
Ph: +61 (0)2 9413 1136 (0900h - 2300h UT +11h) (Home)
      +61 (0)417 671 541 (0900h - 2300h UT +11 h) (Mobile)