 New track was laid from near the workshop area to these pits, on a route planned to run alongside and to the west of the proposed Wareham to Swanage railway.When the London and South Western Railway line to Swanage was built, a standard gauge exchange siding was laid to allow clay to be transferred from the clay trucks to main-line trucks, but most of the clay continued to be hauled by horses to Middlebere Quay.At the same time a tunnel was provided under the main line railway for use by the plateway to the original workings.