| RE 2 Rhein-Haard-Express | 
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| Locale | North Rhine-Westphalia, Germany | 
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| Route number | 425 | 
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| Line length | 144 km (89 mi) | 
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| Operating speed | 160 km/h (99 mph) (maximum) | 
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| Source: NRW rail archive, German railway atlas |  
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Route from 12/2002 until 12/2010  | 
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| RE 42 Niers-Haard-Express | 
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| Locale | North Rhine-Westphalia, Germany | 
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| Route number | 425 | 
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| Line length | 123 km (76 mi) | 
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| Operating speed | 160 km/h (99 mph) (maximum) | 
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| Source: NRW rail archive, German railway atlas |  
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The Rhein-Haard-Express (RE 2) is a Regional-Express service in the German state of North Rhine-Westphalia (NRW), running from Osnabrück via Münster, Recklinghausen, Gelsenkirchen, Essen and Duisburg to Düsseldorf.
The Haard-Bahn (RE 42) operated at an interval of about half an hour after RE 2 on the section between Münster and Essen. This differed only by an additional stop in Recklinghausen Süd, which RE 2 stops at only in the off-peak.
On 11 December 2016, the Haard-Bahn changed its name to Niers-Haard-Express (RE 42) and extended to Duisburg, Krefeld and Mönchengladbach. Since December 2019, the additional trains in the peak hour between Haltern am See and Essen have been replaced by a service every 30 minutes between Münster and Essen.