A pig segment for actively propelling a pig in elongated hollow bodies, preferably in gas and oil pipelines. The segment includes a drive comprising at least one motor, at least one supporting element by which the pig segment can be supported on an inner surface of the hollow body, and at least one bearing element that is movable along a longitudinal axis of the pig segment by the motor. The supporting element is pivotably arranged on the bearing element such that the supporting element can adopt a supporting position In the supporting position, a supporting force is produced relative to a force exerted on the bearing element in a longitudinal direction. The invention also relates to a pig with a pig segment of this type.