Product Code Database
A structure gauge, also called the minimum structure outline, is a diagram or physical structure that sets limits to the extent that bridges, tunnels and other infrastructure can encroach on rail vehicles. It specifies the height and width of station platforms, and , and the width of the doors that allow access to a warehouse from a rail siding. Specifications may include the minimum distance from rail vehicles to , buildings, lineside electrical equipment cabinets, railway signal equipment, or supports for .
A related but separate gauge is the loading gauge: a diagram or physical structure that defines the maximum height and width dimensions in Rail transport vehicles and their loads. The difference between these two gauges is called the clearance. The specified amount of clearance makes allowance for wobbling of rail vehicles at speed or the shifting of vehicles on curves; consequently, in some circumstances a train may be permitted to go past a restricted clearance at very slow speed.
has a definition of "physical clearance" between roadway surface and the underside of bridge element. The code also defines the clearance that is shorter than the physical clearance to account for sag curves, bridge deflection and expected settlements with a recommendation of minimum clearance of . In UK, the "standard minimum clearance" for structures over public highways is . In United States, the "minimum vertical clearance" of overpasses on Interstate Highway System is .
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