Penrhyndeudraeth Station, Ffestiniog Railway, Including Railed Railway Embankment Adjoining to the N

This is a Victorian railway station, built alongside the Ffestiniog Railway. It comprises a main building containing a waiting room and offices, and a U-shaped storage and service block attached to the southeast. The buildings are constructed using timber-studded and vertically-boarded cladding, with renewed yellow brick chimneys at the rear of the main block. They have slate roofs.

The main station building is rectangular, with a fish-scale slate roof and projecting scalloped eaves. A covered verandah runs along the front (platform) elevation, created by recessing the building below its roof pitch and supported by six thin iron columns. The front elevation features three entrances on the left side; the most left-hand entrance has a window to its right, with a station clock fixed alongside. The other entrances are each paired with windows to their left. Throughout the building, there are 20-pane unhorned sash windows and boarded doors.

The adjoining U-shaped block is divided into two parts. The left-hand part is an L-shaped structure with the same timber-boarded cladding as the main building, featuring two boarded doors and two multi-pane windows. The right-hand part is a rubble stone construction, containing a gabled engine house to the right with sliding boarded doors. A boarded door and a 20-pane window are found in the recessed left-hand portion.

Access to the station from the road is via a short inclined path flanked by a pair of rough-dressed square piers with stone cappings. The path is supported by a slightly battered slatestone revettment with a sloped parapet wall. The right-hand pier is built against a slatestone rubble revettment of the associated railway embankment, standing approximately 2 metres high at this point. This embankment is protected by plain spike railings with chamfered posts at intervals of around 2 metres, topped with pyramidal cappings. The embankment continues eastward for about 86 metres before reducing to a height of 0.50 metres, and extending for another 12 metres as a cock-and-hen coped slate wall. Pedestrian crossing points are provided at 32 metres and 86 metres, where the railings curve inwards, defined by plain slate posts.