BNSF 6522 heads up the "North Bay" on it's journey up Tehachapi Pass.
Daylight fades as a high priority UPS train rolls through Monolith, having crested Tehachapi Pass only minutes earlier.
Dynamic brakes hold back a high priority "Z" train on its descent towards Mojave.
Hot North Bay CA to Willow Springs IL UPS train heading upgrade towards Tunnel 2