Painted tie marking some significant (but unknown to me) boundary along an industrial track launching off from the mainline to wend its way somewhere deep into the heart of the Bayview district of San Francisco.

Shot with the Nikon D70s and the 18-70mm f/3.5-4.5 zoom at 70mm, ISO 400, f/7.1, shutter 1/2500 sec. Exposure, highlights, and levels adjustments in Aperture.