|Steel RPO cars begin replacing dangerous wooden cars.
||20.407 Railway Postal Clerks earn an average salary of $2,067 per year.
Newton bros. steal 3 million in cash and goods from Chicago, Milwaukee, St Paul train.
|U.S. Post Office introduces the first Highway Post Office bus.
||Railway Mail Service is renamed the Postal Transportation Service.
||President Eisenhower signs the Federal Highway Act creating the interstate road system.
||U.S. Post Office terminates or reduces many railroad mail carrying contracts.
||Final run of Highway Post Office bus.
||The Railway Post Office makes its final run. The last RPO delivers the mail between Washington DC and New York.