An inner arm, pairing the existing long breakwater (built between 1848 and 1876) was planned from Salt Island. The isolated broad gauge tramway railway from the Holyhead Mountain quarry used to build the former had a branch to Salt Island, via Newry Beach, to facilitate this. Although started with an intention to be 2,100 feet long, the inner arm was never developed beyond a rubble spit at the northern tip of the island. Stone blocks that supported this tramway are still to be found along the upper seafront of Newry Beach. No trace remains of the, presumably, wooden viaduct across the Borth Sach inlet which provided access to the island. During the 1990s the remains of rails were still to be found amongst the large boulders deposited as the foundations for the inner arm.