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Railway line Riga - Ogre - section of the line Riga - Aizkraukle - Krustpils of the Latvian Railway.
In 1959, according to the Lengiprotrans project, the Riga - Ogre section was electrified for a DC voltage of 3 kV. In the same period, the institute at the site developed a coded automatic blocking of alternating current.
