| Year | 1941 |
| Date | 27-Mar |
| Volume | 84 |
| Issue | 2,081 |
| Page | 246 |
| Category | Railway |
| Part | 14 |
| Title | Railway Signals. Standard Semaphore Types used in Pre-grouping Days |
| Author | O.S.Nock |
| Notes | Metropolitan Railway. A typical electric upper-quadrant signal with shunt arm below, examples of the earlier type of signal fittings (photo by T.S.Lascelles) |