After an accident while shunting, local and long-distance traffic on the railway line between Hanover and Hamm is disrupted.
A train jumped off the rails near Minden on Wednesday, a railway spokeswoman said on Thursday.
After the salvage, repairs might still have to be made along the route.
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Long-distance traffic on the nationwide connection between Berlin and North Rhine-Westphalia will be diverted and there will be delays and partial failures in regional traffic.