This subseries contains the tariffs of the Copper Range Railroad Company, as well as other railroads and groups of railroads. Most records are from the General Freight and Passenger Agent's Office.

Tariffs are published documents that indicate the shipping rates and rules of a railroad or group of railroads. Each Copper Range Railroad Company tariff is based on a rate authority file (authority file number is usually noted on the tariff). However, rate authority files also cover tariffs issued by other railroads and concurred with by the Copper Range Railroad. The rate authority files themselves include correspondence, hearing transcripts, drafts, orders from regulators, and other material.