Most people don’t think of ordinary train track as a piece of electrical hardware, but it is. Signal block boundary along the Caltrain line in Sunnyvale.

Shot with the Nikon D70s and the 18-70mm f/3.5-4.5 zoom at 18mm, ISO 400, f/7.1, shutter 1/500 sec. Exposure, saturation and highlights adjustments in Aperture.