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The unmanned locomotives - to which the boats were attached by a tow line and an electric line for control - received current from a trolley line. After World War One, even tanks and other military vehicles were used to tow barges (picture above), without much success. This was invented in 1930, but not available outside military use until after World War 2 during which a telegraph cable using it was laid across the English Channel to support troops following D-Day. They only saw limited use for unmanned mules, for instance in tunnels and in ports - an obvious advantage of most of these unmanned systems was that they kept the banks of the canal free. It consisted of an unmanned electric mule, operated from the barge, riding on a rigid rail or rack, or suspended in the air on a cable, parallel to the canal - either on the banks or over the water. A similar rack system designed by Wood was tested on a part of the Erie canal in 1903. The results were very positive: four loaded boats were hauled at a speed of 7.2 km/h (4.5 mph), compared to 2.8 km/h (1.75 mph) for a mule towing one barge, and this without threatening the banks.

Surgery can often prove successful - but only if undertaken before serious internal damage results. The fire hazard of grouped cables can be significant. With the Lamb system, on approaching another boat coming from the opposite direction, motors were stopped, cables were disconnected, and boats exchanged cables (and thus motors) and proceeded. In 1898, the Lamb system was tested on the Finow Canal in Germany, but the Germans decided in favour of electric mules. The first sector of the electric utility industry to be deregulated was the network of high-voltage transmission wires, which were designed to make bulk power transfers, over relatively short distances, from large power-generating plants to the cities and towns where the power was needed. TVA built, owns, and operates 17,000 miles of transmission lines, to service its customers over an area including all or parts of seven Southeastern states. It oversees 56,070 miles of transmission lines, and plans regional transmission expansion to maintain grid reliability and relieve congestion. However, these lines, hundreds of miles long, would not be necessary, if the mandate existed to build new nuclear plants where the capacity would be near the load centers.

These are not public works like the Panama Canal which would take decades and require thousands of workers (or energy-guzzling machines) to build. Thus I thought there might be some effect like the Hall effect with local charges appearing, but once again I do not see why that would be. Which takes us to your local loop's next stop: the actual switch. They were built by the utility company that had built the power plant, and as the grid grew, local lines were connected to other utilties' power lines to be available in case of emergencies. From the time of President Franklin Roosevelt's regulation of the industry in 1935, the intention of the engineers who designed the electric grid was to deliver reliable, economical electricity, to every farm, family, and factory in the United States. During the 1977 blackout in New York, for example, power was transferred in from the Tennessee Valley Authority system in the Southeast, to restabilize the grid.

Over the ensuing 30 years, the company began electric, gas, water, steam, transit, and even ice services, in New Jersey, New York, Pennsylvania, West Virginia, Virginia, Ohio, Indiana, Michigan, and Illinois. When two tractors going in opposite direction met, they switched barges and drove back to where they came from (one barge had to navigate over the sunken towline of the other). Some other systems allowed for the passing of two barges without exchanging motors, even if the track was laid out only on one side of the canal. But, as can be seen on the illustration above, this could be bypassed with an extra dock and two tracks (this design was actually built on the Teltow canal). Today, thanks to deregulation, a company can earn more profits by not building anything, and instead charging more for what they already produce, by creating shortages. All the above is more than a gallery of obsolete technology. And as always, obsolete systems can be substantially improved with today’s technology and materials. However, one thing we do know is that it can kill, or at best result in the necessity for emergency abdominal surgery.

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