mail train
A train used by the postal service to transport mail, and in some cases, to sort mail en route.
mail train: locomotive hauling sorted and unsorted post
A mail train is a passenger or freight train operated primarily to transport postal matter, with dedicated mail cars that may include sorting facilities. Unlike parcel trains or general freight services, a mail train follows a fixed schedule that coordinates with postal distribution networks, moving letters, parcels, and sometimes newspapers between distribution centers and regional sorting offices. The train must arrive on time; delays disrupt the entire mail cycle.
The mail car itself, called a railway mail car or traveling post office (TPO), is a specialized railway vehicle fitted with sorting tables, pigeon holes, and mail bins. These cars are staffed by postal workers who sort and bundle mail during transit, a practice that was standard on longer routes through the 20th century. The car must be well lit, heated in winter, and equipped with a mail loading dock at each end to allow quick exchange of sacks without uncoupling.
Operating practice and decline
Mail trains typically operate at night or in early morning hours to ensure mail reaches regional centers by daylight, when local delivery routes begin. They run fixed routes with scheduled stops at major post offices, often on lines that serve smaller towns that might otherwise lose postal access. The train's composition usually consists of one or more mail cars, a baggage car for parcels, and sometimes a passenger coach where postal staff can rest during overnight runs.
Most countries have phased out mail trains since the 1960s, replaced by truck convoys and rail freight services contracted by postal authorities. The decline reflects increased road infrastructure, the rise of parcel sorting hubs, and the cost of maintaining dedicated rolling stock. However, some mail trains persist in countries with limited road networks or on routes where consolidated rail freight remains economical; examples exist in Scandinavia, Japan, and parts of India.
The term 'mail train' also historically referred to expresses that carried high-value registered mail under armed guard. These operated on premium routes with priority access and carried security features uncommon on ordinary mail cars, including reinforced doors and compartments for bullion or securities. Such trains became obsolete with modern banking and the decline of international mail value.