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 has written professionally about computers since 1991, so he was writing about retro computers when they were still new. He has been working in IT professionally since 1994 and has specialized in vulnerability management since 2013. He holds Security+ and CISSP certifications. Today he blogs five times a week, mostly about retro computers and retro gaming covering the time period from 1975 to 2000.