Abstract: A trolley system is provided which includes a powered tow trolley that travels along a rail, an end trolley that is fixed to an end of the rail, and several intermediate trolleys that travel along the rail between the tow and end trolleys. All trolleys are interconnected with a flexible tow line. Each intermediate trolley is provided with an individual mechanical brake for preventing movement along the rail until the brake is actively released by either a pulling or pushing force exerted on the corresponding trolley. The trolleys may include saddles for supporting for example, a load of cables or hoses festooned between the trolleys that are used for powering a moving machine connected to the tow trolley.