 Produce from the upper quarries was not a problem, but Wellington, Ellis, Turner, Harriet and Victoria quarries were all below the level of the railway.This was a problem solved in the 1840s when the lake level railway was built, and the quarry as we know it began to take shape.Adelaide quarry became a part of Allt Ddu, and Chwarel Fawr and Chwarel Goch became linked to it too.