| Year | 1952 |
| Date | 28-Aug |
| Volume | 107 |
| Issue | 2,675 |
| Page | 292 |
| Category | Locomotive |
| Part | |
| Title | Twin Sisters. Two 5-in. gauge locomotives, exactly alike externally but very different internally |
| Author | J.I.Austen-Walton |
| Notes | Cylinder drain cocks. System 2, details, the plot thickens, further example (showing Mr Younghusband's excellent work), progress report |