Hall's Tramroad, Abercarn
1805 Benjamin Hall (1778–1817) built a tramroad to transport coal from collieries in the Sirhowy Valley to the tramroad and canal system of the Ebbw Valley leading south to Newport. It linked the Western Valley Tramroad with Manmoel in the Sirhowy Valley and thus was one of the few early cross-country east-west lines.
The tramroad, known as Hall's Road, had been relaid with edge rails to standard gauge by 1860.
It crossed the GWR Aberdare extension of 1857 at Pennar junction west of the tunnel.