The Collaborative International Dictionary of English v.0.48:

Express \Ex*press"\, n. [Cf. F. expr[`e]s a messenger.]
   1. A clear image or representation; an expression; a plain
      declaration. [Obs.]
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            The only remanent express of Christ's sacrifice on
            earth.                                --Jer. Taylor.
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   2. A messenger sent on a special errand; a courier; hence, a
      regular and fast conveyance; commonly, a company or system
      for the prompt and safe transportation of merchandise or
      parcels.
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   3. An express office.
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            She charged him . . . to ask at the express if
            anything came up from town.           --E. E. Hale.
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   4. That which is sent by an express messenger or message.
      [Obs.] --Eikon Basilike.
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   5. a railway train or bus for transporting passengers or
      goods with speed and punctuality; a train or bus that does
      not stop at certain stations. Contrasted to local; as,
      take the express to get there faster.

   Syn: express train. [PJC]

   Express office, an office where packages for an express are
      received or delivered.

   Express train, a railway train (such as a subway train)
      that does not stop at certain stations, but only at
      stations designated express stops.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Express train \Express train\
   Formerly, a railroad train run expressly for the occasion; a
   special train; now, a train run at express or special speed
   and making few stops.
   [Webster 1913 Suppl.]