It branches from the Hanover–Altenbeken line in Weetzen, which is in the municipality of Ronnenberg, and extends from there through Gehrden, Wennigsen, Barsinghausen, Bad Nenndorf and Haste to the Hanover–Minden line.
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The network was extended via the Deister Railway to Barsinghausen, Bad Nenndorf and Haste and also via Springe to Hamelin.