| Dortmund–Iserlohn railway | 
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| Line number | 
- 2103 (Dortmund–Soest)
 
- 2113 (Dortmund-Hörde–Schwerte)
 
- 2841 (Schwerte–Iserlohn)
  
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| Locale | North Rhine-Westphalia, Germany | 
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| Route number | 433 | 
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| Line length | 38 km (24 mi) | 
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| Number of tracks | 2: Dortmund Hbf–Schwerte | 
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| Track gauge | 1,435 mm (4 ft 8+1⁄2 in) standard gauge | 
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| Operating speed | 
- Dortmund-Hörde–Schwerte: 90 km/h (56 mph) (max)
 
- Schwerte-Iserlohn:: 100 km/h (62 mph) (max)
  
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| * Planned installation of a shunting connection.
 Source: German railway atlas  |  
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The Ardey Railway (German: Ardeybahn) is a 38 km long railway line running from Dortmund via Schwerte to Iserlohn (KBS 433) in the German state of North Rhine-Westphalia.