Abstract: A linear irrigation system includes a linear irrigator movable in a first direction along a path of travel and including plural towers supporting a truss assembly extending laterally in a direction substantially perpendicular to the path of travel. The truss assembly carries a plurality of sprinklers connected to a water supply pipe. A plurality of hydrants are spaced along the water supply pipe, each hydrant having a valve, and a pair of laterally adjacent trolleys are mounted on an elongated frame for movement in two opposite directions, each trolley having a docking station and hydrant valve actuator, the docking stations resiliently suspended from said trolleys for movement in at least three mutually perpendicular directions and adapted to engage and disengage, successively, the plurality of hydrants on the supply pipe extending below and between the pair of trolleys. The trolleys and docking stations may be carried on a mobile cart or incorporated into the linear irrigator.