The dump site is located on the southern bank of the Grey River, close to the Midland Line and State Highway 6.
When the cost of scrap metal dropped below an economic level, the New Zealand Railways found other uses for withdrawn locomotives and rolling stock.
Some were discarded in locomotive dumps to protect the railway formation against erosion or soft ground.
The railway line at Omoto suffered from severe erosion caused by flooding of the adjacent Grey River.
Since disposal, Omoto, along with other locomotive dumps, has provided a treasure trove to many people interested in Railway archaeology.