In case of power supply of large, energy-intensive receivers, which are moving on high distances (100 metres or more), using the self propelled on track trolleys is very helpful.

This kind of trolleys are used in festoon cables with conventional trolleys and are controlled by information about current speed, they are creating the power steering system of festoon. They eliminate harmful effects caused by driving resistance.

For example : STS cranes – often used in offshore industry sector, in transshipment terminals.