| Year | 1989 |
| Date | 05-May |
| Volume | 162 |
| Issue | 3,848 |
| Page | 556 |
| Category | Countryman's Steam |
| Part | 10 |
| Title | Superba. Fowler Class Z7 and Superba Ploughing Engine in 2 in. scale |
| Author | John Haining |
| Notes | More engine comparisons, gear train data, driving hub and axle |