Tire and traction spindle on a piece of maintenance-of-way equipment parked next to the tracks, just north of Oak Grove crossing in Burlingame, California.

Shot with the Nikon D70s and the 18-70mm f/3.5-4.5 zoom at 70mm, ISO 400, f/10, shutter 1/400 sec. Exposure, contrast, saturation, and levels adjustments in Aperture.