Abstract
IT is stated in the Bulletin of the Oerlikon Co. that an underground railway has recently been built in Zurich for the conveyance of letters and express packets between the branch post office at the main railway station and the Sihl post office, which are about three quarters of a mile apart. The railway is practically automatic. A driver less electric track is set in motion by pressing a push button on the main control panel. At the railway station terminus the track runs on to a lift, which operates automatically, rising to the level of the post office above. The railway is operated by a three-phase 220-volt, 50-cycle supply. This obviates the need for converter sets or special gear on the motor track for reversing. To reverse, all that is necessary is to interchange the connexions of two phases of the supply.
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Swiss Postal Railway. Nature 146, 195–196 (1940). https://doi.org/10.1038/146195d0
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DOI: https://doi.org/10.1038/146195d0