The Marx 761 train set was a windup set headed by Marx M10005 diesel engines, one with a clockwork motor and one unpowered, along with freight cars. It allowed Marx to use up slow selling obsolete inventory. Marx sold it from 1951 to 1953, when presumably it had worked through its surplus of locomotives.
David Farquhar is a computer security professional, entrepreneur, and author. He started his career as a part-time computer technician in 1994, worked his way up to system administrator by 1997, and has specialized in vulnerability management since 2013. He invests in real estate on the side and his hobbies include O gauge trains, baseball cards, and retro computers and video games. A University of Missouri graduate, he holds CISSP and Security+ certifications. He lives in St. Louis with his family.