Something Bicyclebob said reminded me of this-
Quote:
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To get the best features of cars and trains in one system, small units can be combined into short railway trains under automatic control. They can be private cars that also have road wheels, or dedicated public transit cars that enter from stations. These stations could also dispatch cars filled with a few pallets of freight, robotically handled for most of their journey. The pallets, in turn, might be loaded with small containers or standard, bar-coded boxes for courier delivery.
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The pedal powered version-
The Shweeb – World’s First Human Powered Monorail Racetrack, Rotorua