Probably Deutsche Bahn AG and/or Harzer Schmalspurbahnen GmbH
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Signal-box at Wernigerode.
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Picture taken on 1998-07-17 at Wernigerode.
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Photo and scan: <A HREF="mailto:railfaneurope.net@Michael-Kaben.de">Michael Kaben</A>, 24214 Schinkel, Germany