| Year | 1923 |
| Date | 27-Sep |
| Volume | 49 |
| Issue | 1,170 |
| Page | 346 |
| Category | Railway |
| Part | 6 |
| Title | Some Notes on the Development of Railway Signalling |
| Author | E.H.Ellingham |
| Notes | Safety Precautions. Trap points, electric fouling bar, electric lever lock, Saxby & Farmer derailer |