 The route, which traversed an incline of 1 in 5 approximately half a mile from the harbour, passed beneath the GWR station through a tunnel at King's Moor.When the South Wales Railway was authorised, the directors of the Saundersfoot Railway and Harbour Company decided to seek powers to build a line linking both Tenby and Saundersfoot to the SWR Pembroke branch at Reynalton.This was authorised in 1846 as the Tenby, Saundersfoot and South Wales Railway and Pier Company, with authorised capital of £140,000.