| Year | 1920 |
| Date | 05-Aug |
| Volume | 43 |
| Issue | 1,006 |
| Page | 108 |
| Category | Railway |
| Part | |
| Title | Railway Signalling Systems |
| Author | F.Raynar Wilson |
| Notes | Victorian Government Railways. Chapter 7. - Low-Pressure Pneumatic Automatic Signals, top post mechanism, four section |