| Year | 1930 |
| Date | 10-Apr |
| Volume | 62 |
| Issue | 1,509 |
| Page | 352 |
| Category | Locomotive |
| Part | |
| Title | Shops, Shed and Road. A Column of "Live Steam" |
| Author | LBSC |
| Notes | Piston valves on small locomotives, how piston valves answer on 2 1/2-in. gauge, experimenting with the larger sizes, finished 2 1/2"g. piston valve "Pacific" at full speed (on the revived "Norbury Light", LBSC photo by C.Holt), how the valve gear was altered, valve gear of 3 1/2"g. locomotive by Mr Rees |