Historically and for land forces, this usually referred to troops that are endowed with horses. They can still be of use nowadays to transport goods under difficult circumstances (for instance: weather, topography) where motorised ground troops or aerial forces can not be deployed.
The US DOD Dictionary of Military Terms defines the term train as:
- A service force or group of service elements that provides logistic support, e.g., an organization of naval auxiliary ships or merchant ships or merchant ships attached to a fleet for this purpose; similarly, the vehicles and operating personnel that furnish supply, evacuation, and maintenance services to a land unit.
- Defence Technical Information Centre DOD Dictionary of Military Terms, (DTIC DOD Dictionary)
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