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Cable is very strong in tensile strength, with a breaking strength in excess of 1000 lbs for these types of uses, and is a suitable in-fill material for a railing ("guard" in ICC codes). Typical diameters are 1/8", 3/16" for residential and 3/16" and 1/4" for commercial applications. [ 5 ]
The steel-framed overpass is an architecturally sympathetic addition. Railings are a more restrained version of the original railings found on the platform. It is floored in wood plank and roofed with slats covered by standing seam metal. At its west end is a covered veranda leading into the control house. [4]
Guardrails in the US are generally required by code where there is a drop of 30 inches (0.76 m) or more. Examples of this are both architectural and environmental. Environmental guard rails are placed along hiking trails where adjacent terrain is steep. Railings may also be located at scenic overlooks.
Codes also generally require that there be a 1 + 1 ⁄ 2 inches (38 mm) clearance between the underside of the handrail and any obstruction—including the horizontal bracket arm. There is an allowance however for variations in the handrail size—for every 1 ⁄ 2 inch (13 mm) of additional perimeter dimension over 4 inches (102 mm), 1 ⁄ 8 ...
At the top of the stairs, the horizontal portion of the railing is called an "over easing". Core rail: Wood handrails often have a metal core to provide extra strength and stiffness, especially when the rail has to curve against the grain of the wood. The archaic term for the metal core is "core rail".
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