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Ha! Found a vintage one:http://imagebase.lib.vt.edu/index.phpAnother view:http://spec.lib.vt.edu/imagebase/norfolksouthern/full/ns1197.jpeg
YES PLEASE!!I have plenty of photos, but they won't let me in to take measurements. I really want to produce it.
The ramp is constructed of heavy duty 15” structural channel continuously welded and covered with 5 lb. non-slip, self-cleaning grating with support channels under the main traffic area. The opening is 100” wide for traffic with handrails provided on both sides full length to aid in pedestrian traffic. The undercarriage is constructed of the same heavy channels and mounted on four rear and two front 10 ply high floatation tires for added stability. The overall length of the unit is 84’ and is designed with a maximum of 4 degrees concave angle change to accommodate the low ground clearance of many new vehicles.