hump
v.— « Some railroad workers don’t appreciate the general public wandering around in their yards. There’s a good reason for this. Quite a few idiots get killed every year when they wander behind or under a train while the cars are being humped (hooked together by the engine, usually done at speeds of up to 15 mph).» —“Benching 101″ by Seetwist Faster Than the World May 29, 2007. (source: Double-Tongued Dictionary)
Further reading
When a teenager went a week without talking as part of a school project, he noticed a surprising side effect: Instead of rehearsing a response to what other people were saying to him, he was focused on listening — and feeling smarter as a result...
In an article in The Atlantic magazine, humorist Mark Twain quoted a sing-songy bit of doggerel about conductors punching railroad fares that illustrates how colored paper has long been used to encode information. This is part of a complete episode...