Cable trains (or funiculars) are one of the most energy-efficient modes of transport out there.
A large portion of the power required to pull up the ascending car is delivered by the counterweight of the descending car.
Many historical systems used this efficiency and took it one step further with systems exclusively powered by water and gravity.
A large-scale introduction of electric cars faces many technological hurdles and promises to be time-consuming and expensive. Greening public transportation and cargo traffic, on the other hand, could be done fast with existing technology for a reasonable price - if we opt for the trolleybus and the trolleytruck.
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