Many countries have had dedicated railway services for the delivery of postal mail.

Examples include:

• In Australia, the Travelling post office, Queensland

  In Austria, the (1850–2004)

• In France, the (1984–2015) were rail cars built specifically for , which had run rail services since 1846

In Germany, as well as the (from 1840s), several cities have their own mail trains, including:

• in Berlin

• in Munich

• In Switzerland, the has run since 1847

In the United Kingdom, the Travelling Post Office (1830–2004) was a service where post was sorted en route

• The London Post Office Railway (1927–2003) operated in dedicated tunnels under London

In the United States, the Railway Mail Service (1862–1978) of the United States Postal Service carried the vast majority of mail from the 1890s until the 1960s

• The Railway Mail Service used railway post offices within passenger services to sort post en route

• The use of the Chicago Tunnel Company for mail freight inspired the London Post Office Railway