Vanderbilt’s discovery of this treachery provided the context for what is said to be one of the most famous letters in the history of American business: “Gentlemen: You have undertaken to cheat me. I won’t sue, for the law is too slow. I’ll ruin you. Yours truly, Cornelius Vanderbilt.” This terse, belligerent note is pure Vanderbilt. It is also mythology. It first appeared decades later, in Vanderbilt’s obituary in the Times, and its validity is dubious at best.