Ind. Code § 8-4-5-1

Sec. 1. Whenever two (2) or more railroad companies have heretofore become associated, or shall hereafter become associated, in jointly making or running their roads under any contracts formed or to be formed by such companies, and desire to assume one (1) common name, it shall and may be lawful for such companies, by resolution of their respective boards of directors, entered upon their records, to adopt such name as shall be agreed upon.