Union Pacific train MOGWC-14, an Ogden UT to West Colton CA Manifest, passes under the cantilever signals at Cajon (elevation 3116-feet [949.75 meters]), in the heart of southern California's famed Cajon Pass. UP AC4400CW 5600, SD70ACe 8643, UP AC4400CW 7116, ES44AC 7445 and AC4400CW 6197 are in dynamic brake mode to keep this long, heavy train in check as it descends Cajon's 2.2% grade. (Cajon Pass, California – February 19, 2023)
… Oh, and those "spy balloons"? They are simply there to alert aircraft to the high tension power lines in the area. Nothing to see here … move along …