A railing system is used to move object around a room or building. The system usually consist of 2 rails one upper and one lower, with a set of wheels attached to a harness which an object can be placed.
Normally a seat and straps is used instead of an object in which a person can sit. The seat usually contain one or several holes in which a penis or object can be can be inserted, whilst a person is sat on the seat. A person will often sit in the seat and another will move them around the room inserting objects in to the holes contained within the seat.
"Andrew enjoys being monkeyed whilst sitting in his railing system"