Northwestern tunnel entrance of the tunnel near Cotta.
It was built in 1893/1894 to connect a quarry to the railway to Pirna. 
Since 1963 it is out of service, and difficult to find because both 
entrances are hidden in the forest. This side is closed with a wall as
well. 2001-07-08.
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photo: <a href="mailto:tbk@uncia.de">tobias b köhler</a>