Snowy Peak. In a notable contrast of landscapes, the sparse desert of Phelan, California transitions to the snow capped summits of the San Gabriel Mountains as Union Pacific Railroad 8431 (SD70ACe) leads a manifest train towards Barstow on the morning of April 4, 2022. This area around Cajon Pass is an extremely busy route, with a constant flow of both Union Pacific and BNSF trains around the clock.