The Collaborative International Dictionary of English v.0.48:

Freight \Freight\ (fr[=a]t), a.
   Employed in the transportation of freight; having to do with
   freight; as, a freight car.
   [1913 Webster]

   Freight agent, a person employed by a transportation
      company to receive, forward, or deliver goods.

   Freight car. See under Car.

   Freight train, a railroad train made up of freight cars; --
      called in England goods train.
      [1913 Webster]

WordNet (r) 3.0 (2006):

freight train
    n 1: a railroad train consisting of freight cars [syn: freight
         train, rattler]