| Year | 1958 |
| Date | 15-May |
| Volume | 118 |
| Issue | 2,973 |
| Page | 629 |
| Category | Ultra Miniature Practice |
| Part | 1 |
| Title | Some problems of design |
| Author | A.A.Sherwood |
| Notes | Prototype and freelance models, commutators, valve gear for steam engine, water gauges, burners, Koala the world's smallest working steam locomotive |