Gauge: Various
The Great Western Railway inherited the Vale of Rheidol Railway (1ft 11½in or 600mm) and the Welshpool and Llanfair Railway (2ft 6in or 760mm) from the Cambrian Railways at the Grouping in 1923, and purchased the Corris Railway (2ft 3in or 685mm) in 1930.
For museum items from the Corris Railway, Vale of Rheidol Railway, and Welshpool and Llanfair Railway, please see their respective headings.
| Catalogue Number | Railway | Type | Description | Image |
|---|---|---|---|---|
| TYWRM:GW001 | Great Western Railway | photograph | photograph of Talyllyn Lake in frame |  |
| TYWRM:GW002 | Great Western Railway | wagon | slate wagon; metal; 2 ft nominal gauge |  |
| TYWRM:GW005 | Great Western Railway | bookmark | souvenir bookmark |  |
| TYWRM:GW006 | Great Western Railway | handbill | Double sided GWR handbill advertising the Festiniog Railway and the Snowdon Mountain Railway |  |