Trade steadily grew. Three small private branches were built to serve the industries of the valley. Near the top of the canal, a branch was constructed in 1800, which ran towards Maesmarchog, and was connected to collieries by nearly of tramroad. At Aberclwyd, a branch built in 1817 served the Cnel Bach limekiln on the river bank. Below Neath, a branch left the main line at Court Sart to connect to a tramroad serving the collieries at Eskyn. Although there are no figures for the tonnage carried, apart from a mention of 90,000 tons of coal in 1810, receipts increased from £2,117 in 1800 to £6,677 in 1830. Subscribers had paid a total of £107.50 for their shares, and dividends were paid from 1806, rising from £2 in 1806 to £18 in 1840. Based on the receipts, it has been estimated that some 200,000 tons of coal were carried when trade was at its peak, supplemented by iron, ironstone and fire clay.