| Year | 1949 |
| Date | 17-Mar |
| Volume | 100 |
| Issue | 2,495 |
| Page | 320 |
| Category | Locomotive |
| Part | |
| Title | Twin Sisters. Two 5-in. gauge locomotives, exactly alike externally but very different internally |
| Author | J.I.Austen-Walton |
| Notes | Frame stretchers, pump and back diaphragm |