BNSF 7902 leads an eastbound intermodal up the Cajon Pass at the location known as Sullivan’s Curve, on September 27th, 2011, on the BNSF Cajon Subdivision.
According to what I find on the web: Railfanning in the Cajon Pass Sullivan’s Curve Sullivan’s Curve is a specific section of the railroad through Cajon Pass that features a sharp curve, providing a challenging and visually striking portion of the route. The curve is named after Herbert S. Sullivan, who made promotional photos at this curve for Santa Fe in the 1940s and 50s.
Tech Info: Nikon D700, RAW, Sigma 24-70 @ 62mm, f/11, 1/500, ISO 640.