Standard gauge horse trams were run initially, until the company completed North Dock power station, which supplied electricity to the tramway.
This period corresponded with a downturn in profitability, and the system was sold to the South Wales Transport Company, with a view to closing it down.
Few details of the trams survive, but three single deck saloons were built for the opening of the tramway, although the manufacturer is unknown, and two more were acquired later.
The horse trams are known to have run in March 1908, but the service was steadily reduced as the rails were lifted and laid to a wider gauge.
Balfour Beatty gave support to the Llanelly & District Electric Lighting and Traction Company financially, who then became the operator of the new tramway.
To convey the passengers, ten open-top double deck trams were ordered from the United Electric Car Company of Preston.
[3] During the First World War, the company borrowed two tramcars from Mansfield & District Light Railways, which was another tramway system owned by Balfour Beatty.
[5] Following a public announcement in November 1929, a bill to sanction the replacement of the trams with trolleybuses was put before the House of Lords in January 1930, and Royal Assent for the Llanelly & District Traction Act 1930 was received on 10 July.
Additional powers contained in the Act included several extensions of the network, and a time limit of five years in which to complete the project.
There were more delays in getting the system completed, but a final inspection took place on 13 February 1933, and trolleybuses began running to Pwll and Felinfoel four days later.
[6] The fleet was supplemented by three Guy BTX three-axle double deck vehicles in 1935, two of which had previously worked on various systems as demonstrators.
At around that time, they ceased to be profitable, and the South Wales Electricity Board looked to dispose of their newly acquired asset in 1951.
[3] Llanelly owned a total of 16 electric tramcars, bought in three batches, although they also ran two borrowed from Mansfield & District Light Railways.
[6] Guy number 36 was a speculative venture by the manufacturer, which was built in 1937 for the Commercial Motor Show, where it appeared with lettering for Llanelly and District.