For a century, passenger trains and the mail were one business, with Railway Post Office clerks sorting letters at seventy miles an hour. In fall 1967 the Post Office canceled nearly all its railroad mail contracts within weeks. The episode follows the dominoes: route discontinuances, the Penn Central bankruptcy, Amtrak, and the last RPO run in 1977, and weighs whether the mail decision killed passenger rail or only set the date.
Historians divide over whether the 1967 cancellations killed passenger rail or merely finished a line already doomed by highways and jets. Credit for inventing the Railway Post Office is also contested between Armstrong and Davis, and Penn Central's collapse had many causes.



