| Year | 1981 |
| Date | 16-Jan |
| Volume | 147 |
| Issue | 3,649 |
| Page | 109 |
| Category | Locomotive |
| Part | 36 |
| Title | Bulldog/Dukedog. A 5 in. gauge G.W.R. 4-4-0 locomotive |
| Author | Keith Wilson |
| Notes | Vacuum pump and relief valve, valves, end covers, vacuum limit valve, backhead clack valve |