Ambiguously phrased safety tag on a maintenance-of-way spur switch just north of Hillsdale station, San Mateo, California.

Shot with the Nikon D70s and the 18-70mm f/3.5-4.5 zoom at 70mm, ISO 400, f/11, shutter 1/320 sec. Exposure, contrast, levels, and highlights adjustments in Aperture.