| Year | 1952 |
| Date | 25-Sep |
| Volume | 107 |
| Issue | 2,679 |
| Page | 414 |
| Category | Locomotive |
| Part | |
| Title | Twin Sisters. Two 5-in. gauge locomotives, exactly alike externally but very different internally |
| Author | J.I.Austen-Walton |
| Notes | The reversing lever, the approach of spring, come in "minor", setting up the lever |