Originally, the railroad was intended to connect to Tucson.
[3] The station of Childs was established in 1916[4] six miles north of Ajo.
Black Gap and Rocky Point were short sidings used when passenger trains met.
[1] In 1998, Phelps Dodge upgraded the railroad for proposed resumed mining at Ajo.
[8] The railroad passes through the Barry M. Goldwater Air Force Range.