SDCL § 49-16A-20: Single-line rates as restraint of trade.

Except where permitted under federal law, membership of a railroad in any group, organization, or bureau, or an agreement for the purpose of discussing or establishing single-line rates, or the establishment of a single-line rate through such a membership or under the influence of such a membership by a railroad, is restraint of trade within the meaning of § 37-1-3.1.