Office of the Commissioner of Railroads, Wisconsin, Formal Case Papers, Railroads, 1905-2016
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Arrangement of the Materials

This collection was received in multiple parts from the donor(s) and is organized into 29 major parts. These materials have not been physically interfiled and researchers might need to consult more than one part to locate similar materials.

Under the Railroad Commission and Public Service Commission, railroad case files were assigned the prefixes R, 2R, and 2SR and were filed in a single numerical sequence. Prefix 2SR indicates street railways; prior to 1931 street railways were given R numbers. 2SRs are interfiled with Rs. Beginning in June 1975, a new file numbering system was adopted. Files now receive a three-part number. A four digit, 9000 number prefix indicates the railroad involved. It is followed by a two letter case type designator. The final portion is a sequential, unique case number. 9040 RX-23 is typical of such numbers, designating the twenty-third case involving the Chicago and Northwestern Railroad. A separate set of unique case numbers is assigned to general cases and to each railroad, creating thirty-six filing sequences. The case type designator has no filing significance. Appendix A provides a key to these docketing codes.