Originally called Duffryn,[1] and then Tirydail, the station underwent a number of name changes before being renamed Ammanford and Tirydail in 1960 following the closure in 1958 of Ammanford station on the Amman Valley branch railway.

At some point between 1891 and 1906 the passenger platform was moved from the north to the south side of the level crossing.

Amenities at the station are basic (despite it being one of the largest towns served on the route), with no ticket provision of any kind (these must be bought on the train or prior to travel).

As well as the aforementioned shelter and a bicycle rack, there is a customer help point at the station entrance and a digital CIS display to provide real-time train running information.

There are five trains a day to Shrewsbury northbound from Monday to Saturday (plus two more to Llandovery) and seven southbound to Llanelli and Swansea (the first train in each direction does not run on Saturdays); two services each way call on Sundays.