The inside of a stack of recycled track sections piled up at the Hillsdale maintenance of way spur, San Mateo, California.

Shot with the Nikon D70s and the 18-70mm f/3.5-4.5 zoom at 70mm, ISO 400, f/7.1, shutter 1/160 sec. Exposure, contrast, highlights, shadows, and monochrome adjustments in Aperture.