Emergency intercom on WMATA railcar 1245. This version of the intercom had two buttons - one on the intercom unit itself, and a second on the wall beneath the intercom.
Ben Schumin is a professional photographer who captures the intricacies of daily life. This image may be used under Creative Commons Attribution-ShareAlike 2.0. Please provide artist attribution, as well as a link to the original photo and to the license terms.