| Year | 1989 |
| Date | 04-Aug |
| Volume | 163 |
| Issue | 3,854 |
| Page | 146 |
| Category | Road Locomotive |
| Part | 3 |
| Title | Sentinel Engine |
| Author | Alan Beasley |
| Notes | Reveals how he designed and built an Undertype engine for a 2 in. scale Sentinel Steam Waggon. Engine casing design, component details and manufacture |