| Year | 2014 |
| Date | 17-Oct |
| Volume | 213 |
| Issue | 4,493 |
| Page | 582 |
| Category | Track |
| Part | |
| Title | Automatic Semaphore Signals |
| Author | Duncan Webster and Paul Middlehurst |
| Notes | Describe the Warrington solution. Track circuiting, mechanical, Great Western centre pivot signal (Photo courtesy of Adrian Roscalen), distant signals, electronics, swing link signal, fault indication, gremlins, loose ends, references |