rolling stock
    n 1: collection of wheeled vehicles owned by a railroad or motor
         carrier

Rolling \Roll"ing\, a.
   1. Rotating on an axis, or moving along a surface by
      rotation; turning over and over as if on an axis or a
      pivot; as, a rolling wheel or ball.
      [1913 Webster]

   2. Moving on wheels or rollers, or as if on wheels or
      rollers; as, a rolling chair.
      [1913 Webster]

   3. Having gradual, rounded undulations of surface; as, a
      rolling country; rolling land. [U.S.]
      [1913 Webster]

   Rolling bridge. See the Note under Drawbridge.

   Rolling circle of a paddle wheel, the circle described by
      the point whose velocity equals the velocity of the ship.
      --J. Bourne.

   Rolling fire (Mil.), a discharge of firearms by soldiers in
      line, in quick succession, and in the order in which they
      stand.

   Rolling friction, that resistance to motion experienced by
      one body rolling upon another which arises from the
      roughness or other quality of the surfaces in contact.

   Rolling mill, a mill furnished with heavy rolls, between
      which heated metal is passed, to form it into sheets,
      rails, etc.

   Rolling press.
      (a) A machine for calendering cloth by pressure between
          revolving rollers.
      (b) A printing press with a roller, used in copperplate
          printing.

   Rolling stock, or Rolling plant, the locomotives and
      vehicles of a railway.

   Rolling tackle (Naut.), tackle used to steady the yards
      when the ship rolls heavily. --R. H. Dana, Jr.
      [1913 Webster]