It’s exact history and origination is a little muddled, however.
The integral members of a truss bridge.
For railway bridges, Figure 9 illustrates an economic lateral system at deck level which consists of a simple single member which also functions as part of.
A Pony truss bridge locates the deck a bit above the middle of the truss similar to the through truss, however this type of truss is designed for lighter.
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