| Year | 1989 |
| Date | 01-Sep |
| Volume | 163 |
| Issue | 3,856 |
| Page | 293 |
| Category | Road Locomotive |
| Part | 4 |
| Title | Sentinel Engine |
| Author | Alan Beasley |
| Notes | Reveals how he designed and built an Undertype engine for a 2 in. scale Sentinel Steam Waggon. The twin camshafts, a piston, crosshead and trunkguide, the cylinder assemblies, casing manufacture, engine assembly and ancillaries |