| Year | 1946 |
| Date | 01-Aug |
| Volume | 95 |
| Issue | 2,360 |
| Page | 108 |
| Category | Railway |
| Part | 7 |
| Title | Railway Interlocking Frames. Saxby and Farmer's 1888 duplex apparatus |
| Author | O.S.Nock |
| Notes | Cross-section of Saxby 1888 duplex-type locking frame, arrangement of duplex tappets, spring catch-box |