Rural mail delivery was made on four-sure feet.
e-wv, The West Virginia Encyclopedia online. / rural delivery, RFD, 1896, farmers, Postmaster General,

In 1896, the nation’s first Rural Free Delivery, known as RFD, was introduced in West Virginia. Prior to this, people in rural areas didn’t have access to mail delivery. To get their mail, farm families had to travel to a town, which, in some cases, could be an all-day trip. And more than half the country’s 76 million people lived on farms.