From The Collaborative International Dictionary of English v.0.48 [gcide]:
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]
From WordNet (r) 3.0 (2006) [wn]:
rolling stock
n 1: collection of wheeled vehicles owned by a railroad or motor
carrier
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