| Langelsheim–Altenau (Oberharz) railway |
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| Native name | Innerstetalbahn |
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| Line number | 1931 |
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| Locale | Lower Saxony, Germany |
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| Route number | 204b |
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| Line length | 33.4 km (20.8 mi) |
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| Track gauge | 1,435 mm (4 ft 8+1⁄2 in) standard gauge |
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0.0 |
Langelsheim |
208 m |
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0.5 |
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0.9 |
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Chemetall siding |
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New course from 1963 |
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Bundesstraße 82 |
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Concrete works siding |
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Chemetall siding |
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End of the route since 1963 |
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5.4 |
Lindthal |
265 m |
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Innerste Dam |
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6.9 |
Innerste |
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10.2 |
Innerste |
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10.6 |
Innerste |
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10.7 |
Lautenthal |
305 m |
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11.8 |
Innerste |
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16.8 |
Innerste |
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17.1 |
Wildemann Tunnel (278 m) |
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17.3 |
Innerste |
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17.7 |
Wildemann |
408 m |
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18.3 |
Innerste |
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18.7 |
Innerste |
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18.9 |
Innerste |
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20.0 |
Silbernaal-Grund |
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20.5 |
Innerste |
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Bundesstraße 242 |
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22.1 |
Frankenscharrnhütte |
483 m |
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Zellbach and Bundesstraße 242 |
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from Ottiliaeschacht |
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25.0 |
Clausthal-Zellerfeld |
536 m |
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26.5 |
Clausthal Ost |
564 m |
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1. viaduct |
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2. viaduct |
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32,4 |
3. viaduct |
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33,7 |
Altenau (Oberharz) |
478 m |
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| Source: German railway atlas |
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The Langelsheim–Altenau (Oberharz) railway (also known in German as the Innerstetalbahn—"Innerste Valley Railway") was a railway line, that ran through the Upper Harz in Central Germany. It was also called the Upper Harz Railway or Harz Railway. It was built in order to enable the Magdeburg-Halberstadt Railway Company (Magdeburg-Halberstädter Eisenbahngesellschaft or MHE) to access the mines in the Harz mountains.