Warning tag on a switch throw lock, guarding a maintenance of way spur near Hillsdale station, San Mateo, California. This tag says, basically, “don’t unlock this unless you’re the one who locked it, because it’s here to keep the train from running me over.” “RWP” stands for Roadway Worker Protection, which makes this one of those phrases like ATM machine or PIN number.

Shot with the Nikon D70s and the 18-70mm f/3.5-4.5 zoom at 70mm, ISO 400, f/11, shutter 1/500 sec. Exposure, contrast, and highlights adjustments in Aperture.