| Year | 2023 |
| Date | 08-Sep |
| Volume | 231 |
| Issue | 4,725 |
| Page | 369 |
| Category | Steam |
| Part | 8 |
| Title | Radial Valve Gears Again |
| Author | Duncan Webster |
| Notes | Chas. Brown's and Heywood's Gear. Sheds light on what is often seen as a complex subject. Chas. Brown's gear, design methodology, Snowdon Mountain version, Ralph on the Snowdon Mountain Railway, Heywood's gear, River Irt (photo courtesy of the Ravenglass and Eskdale Railway), design differences |