 However the available quays were suitable only for small vessels, and the main trade was lighterage to Llanelly Harbour for transhipment, incurring additional expense.When it was decided to develop the St Davids pit above Dafen, the opportunity to improve transport to the sea showed itself; a railway directly from Dafen to a new quay at Machynis Pool (now spelt Machynys) was feasible; there would need to be an incline down from St Davids to Dafen.The proprietors of the Llangennech Coal Company promoted a Bill in Parliament, to make a wet dock for vessels up to 300 tons at Machynis with wharves and warehouses, and build the railway to St Davids.