Train catches fire, explodes in Summit County North Summit Fire Service District A Union Pacific train engine caught fire and exploded early morning on Saturday, Jan. 9, 2021, in Summit County, Utah. and last updated 2021-01-10 03:02:43-05 SUMMIT COUNTY, Utah â A train engine exploded early Saturday morning in rural Utah, according to local fire crews and the train company. While traveling through the area of Wahsatch* in Summit County, the second locomotive of a freight train caught fire around 3 a.m. and exploded, Union Pacific told FOX 13. The North Summit Fire Service District, Uinta County Fire and Summit County Ambulance services responded and were able to put the fire out.