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“Screw”
1955
This relay interlocking system for single-track railways was called "Screw" after the location of the first installation of this type.
The interlocking system was in use from 1955 to 1962 in Västrakulla on the Nybro–Kalmar line.
From 1973 to 1990, the system was used in the training programs of the Transport Administration School (then known as the Railway School).
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