| Year | 1946 |
| Date | 07-Mar |
| Volume | 94 |
| Issue | 2,339 |
| Page | 233 |
| Category | Railway |
| Part | |
| Title | Railway Interlocking Frames. Introduction |
| Author | O.S.Nock |
| Notes | A modern signal-box interior, Bognor Regis, Souther Railway, cross-section of Stevens "Glasgow" type locking frame, standard for Stevens type frame, floorplate |