Bridge Type Help

Another path to go searching along about infrastructure of railroads is to look at the documents and maps that were generated by the Valuation Act (1913). Often referred to as "valuation" or "Val" plans these maps are still used today to locate property lines, curvature, signals, culverts, and bridges in respect to each other (and what the railroad wants to do). Most railroads have simply updated the original survey as changes happen, but you may be able to find older copies in archives. Depending on how well records have been preserved in that area you may be able to obtain copies through a state archive or other such repository/agency.
 
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