A Butterfield Overland Mail Co. celerity wagon from an 1858 drawing by William Hayes Hilton. Wild mules were often used and were a constant problem.
This style of stage, known as a stage wagon, was used from Los Angeles to Fort Smith, Ark.
From the Huntington Library and used in "A Ride on a Butterfield Stagecoach" in "The Butterfield Trail and Overland Mail Company in Arizona, 1858-1861" by Gerald T. Ahnert, 2011.
Read: Construction of the Overland Mail Co. Stage Line in California by Gerald T. Ahnert, 2014.