At its starting point, the cable passed over three large pulleys, actuated by the steam engine, which is placed in a small power house on the edge of the canal (see the above illustration). The boats were propelled by a moving cable on each bank, carried on supports provided with pulleys, and operated parallel to the canal. The line formed part of a 47 kilometre (29 miles) long trajectory served by electric mules (see further) and was only operated for a couple of years. Apart from the ecological advantage, the use of renewable electricity made that the line was working at almost no cost. Moreover, it was a zero-emissions transport system: the electricity was generated on both sides of the track by means of turbines placed at the cascades of two successive locks, having a fall of 7.5 metres (24.5 feet). It's called a loop because the two wires, connected at one end by the switch and at the other end by your phone, allow current to flow all the way around. The main frame allows exchange technicians to connect pairs to the switch as they please.

In modern phone systems the loop power is provided by the switch. These effects are often undesirable, in the first case amounting to unwanted transmission of energy which may adversely affect nearby equipment or other parts of the same piece of equipment; and in the second case, unwanted pickup of noise which may mask the desired signal being carried by the cable, or, if the cable is carrying power supply or control voltages, pollute them to such an extent as to cause equipment malfunction. Towards the end of 1893 (the same year that a propeller powered trolleyboat was tested on the Erie Canal), the first electrically powered submerged flexible cable system was set up in the Bourgogne canal in France. The general arrangement was very much the same as in the trolley propeller method, but instead of turning a propeller, the motor would revolve the hauling drums or machinery. The hauling machinery was operated by an electric motor on the boat, which received current from an overhead trolley circuit (see picture above).

Below is a picture of what seems to be the only propeller powered trolleyboat line that was ever operated in a commercial way. Operation started in 1894 and the line remained in service for more than 20 years. Electric mules on rails turned out to be much more reliable on the towpath than trolleytrucks, being operational every day and both day and night. Most of the underground canals going through mountains and hillsides were too narrow for a towpath. Some of Con Edison's underground infrastructure goes back almost as far as Thomas Edison's first central generating station and underground cable, on Pearl Street in lower Manhattan, in 1882. It was a length of 59-year-old cable whose failure was a factor in the July blackout. The only remedy is to return the intention of the industry to one of providing universally reliable service, by putting the toothpaste of deregulation back in the tube. Also in this case, the trolley line was used to cross a subterranean tunnel, this one ("tunnel de Mauvages") being almost 5 kilometres (3.1 miles) long. It might go to something like a remote line concentrator, or a serving area cabinet, or a loop extender. As has often been noted, FERC has never met a utility merger it didn't like.

The utility companies objected to this potential anarchic use of the transmission grid, and refused to provide these non-utility generators access to their systems. Smaller companies kept using animals as part of a mix of materials. The method was thus easy to combine with horse and mule powered canal boats (contrary to the methods described below). It was a very sophisticated machine, creating almost no wash because of a special arrangement of three propellers, but eventually the electric mule (see further) was preferred. This velocity was not much higher than that of an animal hauled barge, but the electric horse could tow considerably more weight. The cable was installed a few yards from the edge, in order to leave the tow path free. After World War One, even tanks and other military vehicles were used to tow barges (picture above), without much success. The pulleys (shown on the smaller images above and below) were placed vertically on a straight line, and more or less inclined on curves. In 1903, the Germans experimented with a propeller powered trolleyboat on the Teltow canal (first picture above).

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