The entirety of the route from Marton north to Taihape was built to the west of the Rangitikei River and lies predominantly on the terraces within the river valley.
In 1902, a short extension beyond Sanson was opened to the southern bank of the Rangitikei River, opposite Bulls.
Vinegar Hill is on the banks of the Rangitikei River within the Putai Ngahere Reserve, near the junction of State Highway 54 and State Highway 1, about 5 km north of Hunterville in the Manawatu-Wanganui region of New Zealand.
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