popper n.— «The Owen Sound lawyer shelved his legal briefs for a few days to navigate the Canadian Shield in a track motorcar—an odd and colourful contraption used by railroads to inspect lines and transport work crews until the machines...
dead man’s switch n.— «On the subway and elevated lines it is found in the nearest doorman and a “dead man’s switch.”» —“Precautions of Railroads to Prevent Death at the Throttle” in New York Washington...