2) Frisco, the St. Louis-based road warmed early to GE's U25B, acquiring four production units, SLSF 800-804 and the demonstrators GE 753-756, SLSF 804-807. Based at Springfield, MO, the new units were favored for the Tulsa-Birmingham hotshots because of their quick turnaround capability. 3) In the summer of 1963, SLSF ordered eight more units. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.