Trailing wheel

from 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]