| Year | 1980 |
| Date | 15-Feb |
| Volume | 146 |
| Issue | 3,627 |
| Page | 240 |
| Category | Locomotive |
| Part | 21 |
| Title | Bulldog/Dukedog. A 5 in. gauge G.W.R. 4-4-0 locomotive |
| Author | Keith Wilson |
| Notes | Pistons, piston rods, glands and cylinder covers, changes to valve extension rods |