On December 25, 2020, at approximately 6:37 a.m. CST, Union Pacific Railroad Company’s (UP) southbound mixed freight train MSSDM-24 with 3 conventionally configured locomotives handling 100 loads, 8 empties, at 7,408 feet in length and 13,050 tons derailed 24 cars (18 loads/ 6 empties) at milepost (MP) 86.4 on the Mason City Subdivision of the Great Lakes Division near Elkhart (Polk County), IA — approximately 12.5 miles north of Des Moines, IA.