Railroading Heritage of Midwest America (RHMA) is a non-profit organization whose mission is to promote public understanding of the history of railroading in the Midwest of the United States of America. RHMA accomplishes this goal by preserving, restoring, operating and interpreting historic steam and diesel locomotives and rail cars. it was founded in 1991, and since then they have become a leader in the world of historic railroad preservation through various restoration and excursion efforts. They also own and operate Milwaukee No. 261 and now Union Pacific Railroad "Challenger " No. 3985 and No. 5511.