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Span: The distance along a rail from the center of one support to the center of another. In the case of a bridge, for example, Span is the distance between runways.
Capacity: The maximum load that the G-Rail can safely withstand, not including the weight of the hoist.
Capacity Without Truss: The capacity of a G-Rail without a Slant Truss attached. Trusses can be added or taken away, depending on the load and the span.
Capacity with Truss: The capacity of a G-Rail after a Slant Truss has been attached to the top of a G-Rail. The truss will typically multiply the capacity of a rail.
Maximum Span without Truss: The maximum span that a G-Rail can safely withstand for a given load, without a truss.
Maximum Span with Truss: The maximum span that a G-Rail can safely withstand for a given load, with a truss attached.