The Collaborative International Dictionary of English v.0.48:

Trailing \Trail"ing\,
   a. & vb. n. from Trail.
   [1913 Webster]

   Trailing arbutus. (Bot.) See under Arbutus.

   Trailing spring, a spring fixed in the axle box of the
      trailing wheels of a locomotive engine, and so placed as
      to assist in deadening any shock which may occur. --Weale.

   Trailing wheel, a hind wheel of a locomotive when it is not
      a driving wheel; also, one of the hind wheels of a
      carriage.
      [1913 Webster]