Hornby R3661 BR Class 31 A1A-A1A D5509 - Era 6
| Length | 225mm |
| DCC Type | DCC Ready |
| Period | Era 6 (1957 - 1971) |
| Operator/Livery | BR, BR Two Tone Green |
| Class | Class 31 |
| Designer | Brush Traction |
| Entered Service | 1958 |
| Minimum Curve | R2 |
| Age Suitability | 14+ |
| Motor | 5 Pole Skew Wound |
| Wheel Configuration | A1A-A1A |