Allt-wen. From a short canal arm at Pontardawe, east-south-east across the river to Primrose Colliery (1m). Branch at Allt-wen, north to Cwm-nant-Llwyd Colliery (¾m). Opened around 1801. Edge rails, 4' 5½" gauge. This deep mine (600' deep) was sunk and owned by The South Wales Primrose Coal Company Ltd and work commenced in the early 1860s. Several drift mines were also opened on the surface of the leased area. The technology of transporting the coal from Cwm-Nant-Llwyd Colliery down to the main line railway at the foot of the mountain was ingenious and a marvel of its time. A brilliant railway engineer devised the complicated surface railways – self-acting winding drums to lower the drams of coal down the mountainside and then raise the empty drams back to the higher level and on to the mine for refilling. A substantial amount of this railway technology is still extant (2017).
Cwm Clydach. From just west of the Midland Railway station (Clydach-on-Tawe) north to Craig Merthyr collieries, passing Clydach ironworks, and tinplate works, and Graigola Colliery (2¾m). 3' 6" gauge. Later converted to standard gauge and connected to the main line.
Cwmdu. From a point south of Landore, 1m west to pits at Cwmdu (Penlan).
Cwm-Du (Raby's). From near Cwm-nant-Lleiky quarry to Cwm Nant Du collieries, and onwards to the Swansea Canal at Ynysmeudwy (1m). Owner: Alexander Raby, Traffic: stone.
Cwm Gelli, near Landore, Swansea, serviced a quarry at Cnap Llwyd.
Cwm Giedd. From the Swansea Canal at Bont-y-Giedd, northwest up the south side of the River Giedd for ½ mile.
Graigola. From Tyn-y-Coed southeast across across the river Tawe to Graigola Colliery (¾m). Opened 1830.
Hen Neuadd. Plateway, from the end of the canal at Pen-Tawe, east through Abercraf to Cribarth Quarries (1¾m). Branch at Treflemming east up Nant Helen towards Hen-rhyd and Colbren. Opened 1798.
Llansamlet Old Waggonway, Laid along the east bank of the river Tawe (2 - 2½m) with wooden rails. Opened 1798. Closed 1803 and superceded by the Llansamlet Canal. Little trace remains.
Llansamlet (Scott's Railway). From the river Tawe above Foxhole, parallel to Smith's Canal to Scott's Colliery at Llansamlet (approx 3m). Opened 1816, closed c1860.
Palleg (a.k.a Cwm Tyrch. )From Ynysgedwyn northwest along the north side of Afon Tyrch to Palleg Colliery (1½m). Opened 1807.
Ynystawe. From Ynys Tawe east across the river to Garth Pit (½m).
Ynysygeinon. From Pant-y-Ffynon east across the river to Ynysygeinon Pit (¼m). Closed 1861
Ynysymwnd. From Craig-y-Duke southeast across the river to pits at Ynysmwnd (½m).