Surrounded by the colorful walls of the Mojave Desert's 'Grand Canyon' Union Pacific's hotshot 'Denver Z' streaks through southern California's Afton Canyon led by Missouri Pacific painted heritag... (more)

Nestled above the northern bank of the Mojave River the twin steel ribbons of Union Pacific's Cima Subdivision hosts the hotshot 'Denver Z' as it hustles through rugged Afton Canyon, dwarfed by th... (more)