Miner operating coal wagon track, National Colliery, Porth. On the right is a coal wagon truck. On the left is a middle-aged man wearing a flat cap, gloves, an open shirt and tattered jacket and trousers. He holds a wooded brake in his left hand and operates a lever / points with his right hand. In the background is the dark interior of a mine building with a chain and a near-circular iron construction. Black and white image with a range of tones