A method and a system for relocating a modular trolley system for a mining truck in a mine are provided. The modular trolley system includes a rectifier substation and a wire-pole-assembly. At least parts of the rectifier substation and the wire-pole-assembly include a transport coupling section for coupling the trolley system element to a transport coupling tool and for transporting the trolley system element. The method includes disconnecting at least some of the transportable trolley system elements at a first location of the mine, and coupling the respective trolley system elements to the transport coupling tool via the transport coupling section. The method additionally includes transporting the trolley system elements to a second location different from the first location. The method further includes re-connecting the transported trolley system elements of the modular trolley system at the second location of the mine.