BNSF Railway train S-LPCSCO2-23 begins its descent into the Los Angeles Basin as it crests Cajon Pass' Summit and will battle 15 miles of 2.2% downgrade. ES44C4 7155 and ET44C4 3799 will be utilizing their dynamic braking to fight gravity as the train, which originated in Logistics Park near Chicago, heads to its destination: Long Beach CA. (Summit, Cajon Pass, California – December 27, 2019)