When installing and maintaining the overhead contact line, it is possible to reach all working positions simply, quickly and safely. By simultaneously using the positioners remotely controlled from the platform, the pressure on the contact line and the anchor points of the carrying cables can be reduced, and work can be carried out on the insulators and installation brackets. If another crane is used, even the heaviest components, such as the overhead contact line mast or the automatic tensioner, can be replaced within a record-breaking time. The system solution includes many optional matching units.