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Transport postal tubes on existing overhead cables.
It doesn't look like city-wide pneumatic tubes are coming anytime
soon, so here's an inferior alternative.
Use either overhead power lines or overhead phone lines as the
infrastructure for little motorised vehicles that deliver mail, snacks,
or anything else small and light. They'd hang from
wheels, and be
programmed by the line owners to avoid multiple vehicles on a line
that couldn't take it, and maybe avoid some lines altogether.
[caspian, Jan 07 2005]
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||I think automated radio controlled planes (with GPS, anti-collision software etc) would be more feasible... but I still like the image of little trolleys trundling over the power lines (+)