Former Llanarthney Railway Station with single Platform

The former Llanarthney Railway Station features a single platform and associated buildings, including the Station Master's house with passenger facilities located to the west. The structure is built from informally coursed, slightly rock-faced ashlar masonry, accented by limestone quoins with chiselled arrisses. It has a low-pitch hipped slate roof. The passenger rooms are set back, with a roof overhang that serves as a shelter for the platform, supported by a post and a wing wall; the post is dated 1864. There is also a small roof overhang at the rear of the building, which was part of the former waiting room. The passenger facilities include a general waiting room next to the house, a ladies' waiting room, and male and female toilets located at the end of the building under a catslide roof. The platform features brick corbelling and bullnosed limestone edge-paving, with brick and stone kerbs at the rear. At the time of inspection, the buildings were undergoing restoration, with original joinery partially restored. The Station Master's house has a four-panel door, while the waiting rooms have similar semi-glazed doors. The windows are four-pane sash, and one chimney has been rebuilt.