| Present Location | Talyllyn Railway |
| County Location | Gwynedd |
| Designed For | Talyllyn |
| Build Location | Tywyn |
| Built by | Talyllyn |
| Type | O |
| First Number | 12 |
| Present Number | 12 |
| Gauge | 2ft 3in |
| Wheel Arrangement | 4 wheel |
| Original Underframe | No |
| Original Bogies/Wheelsets | No |
| Additional Notes | Based on Penrhyn Open "C", used 1954 only with Penrhyn "D" on new underframe as TR No. 9 (qv). On to new underframe 1956 using running gear from scrapped Festiniog quarrymen's carriages. Rebuilt 1958 to same design as No 13. Air brakes from late '90s. |
| Owner | Talyllyn Railway Co |
| External Structural Condition | Good |
| Internal Structural Condition | Satisfactory |
| Underframe Condition | Very Good |
| External Finish | Very Good |
| Internal Finish | Very Good |
| Degree of External Originality | Some replaced/reproduced material |
| Degree of Internal Originality | Some replaced/reproduced material |
| Degree of Underframe/Running Gear Originality | Some replaced/reproduced material |
| Degree of External Authenticity | Poor |
| Degree of Internal Authenticity | Poor |
| Degree of Underframe Authenticity | Poor |
| Rarity | Few |
| Historical Importance | Some Interest |
| Storage | Secure Building |
| Operating | Yes |
| Survey Date | 28/06/2000 |
| Surveyor | John Smallwood |
| Photo Date | 01/07/2013 |
| Photo by | Ian Smith |
| At Risk | No |
| Date Record Last Updated | 28/04/2016 |
