Three small-wheeled 4-4-0ST locomotives had been built by Robert Stephenson and Company in 1854, but by 1858 they had all been rebuilt as 0-6-0STs and, as such, the last was withdrawn in 1880.
Built to the same design as the South Devon Railway Tornado class with 900-imperial-gallon (4,100 L; 1,100 US gal) water tanks.
Four more broad gauge 0-6-0STs were delivered in 1861, this time from the Bristol builders, Slaughter, Grüning and Company, similar to the South Devon Railway Dido class that they had built the previous year.
16 was hauling a train of coal wagons at Swansea when it fell into the harbour, a moving bridge having been left open.
Four standard gauge 0-6-0T locomotives were built by two different manufacturers, two by Robert Stephenson and Company, and two by the Vulcan Foundry.