| Year | 1946 |
| Date | 18-Apr |
| Volume | 94 |
| Issue | 2,345 |
| Page | 396 |
| Category | Railway |
| Part | 4 |
| Title | Railway Interlocking Frames. Saxby and Farmer's "Rocker and Grid" Type. Part 2 |
| Author | O.S.Nock |
| Notes | The interlocking, locking shafts, on the L.B. & S.C.R., the inside of London Bridge North cabin |