patrol wagon(n = noun.artifact) black maria, paddy wagon, police van, police wagon, wagon - van used by police to transport prisoners;
is a kind of van

   An enclosed truck used by police to transport prisoners. [WordNet 1.5]

airborne patrol, beach wagon, border patrol, chuck wagon, coaster wagon, conestoga wagon, covered wagon, funny wagon, harbor patrol, ice wagon, milk wagon, on the wagon, paddy wagon, patrol, patrol boat, patrol car, patrol ship, police wagon, prairie wagon, round-the-clock patrol, shore patrol, station wagon, tea wagon, united states border patrol, us border patrol, wagon, wagon tire, wagon train, wagon wheel, water wagon, welcome wagon