| Year | 1989 |
| Date | 03-Nov |
| Volume | 163 |
| Issue | 3,860 |
| Page | 578 |
| Category | Countryman's Steam |
| Part | 16 |
| Title | Superba. Fowler Class Z7 and Superba Ploughing Engine in 2 in. scale |
| Author | John Haining |
| Notes | Old Z7 drive layout, hornbracket mounting, Z7 engine photo, Peter Stanier's class AA6 ploughing engine |