 The St Davids colliery, which had been the original purpose of the first Llanelly Railroad and Dock Company, was no longer the principal location for coal extraction in the area, and the incline operation was inconvenient.In 1903 the line was diverted from Dafen to new collieries at Penprys and Acorn Pits, and the St Davids incline was closed.The first line to collieries at Gwaun-cae-Gurwen similarly involved difficult incline operation, and the GWR obtained an Act in 1904 authorising a new line avoiding the inclined plane.