| Year | 1950 |
| Date | 16-Feb |
| Volume | 102 |
| Issue | 2,543 |
| Page | 215 |
| Category | Locomotive |
| Part | |
| Title | Twin Sisters. Two 5-in. gauge locomotives, exactly alike externally but very different internally |
| Author | J.I.Austen-Walton |
| Notes | Brake shoes, equalisers, the brake cylinder, brake shaft and bearings |