| Year | 1941 |
| Date | 13-Feb |
| Volume | 84 |
| Issue | 2,075 |
| Page | 125 |
| Category | Railway |
| Part | 11 |
| Title | Railway Signals. Standard Semaphore Types used in Pre-grouping Days |
| Author | O.S.Nock |
| Notes | Great Northern Railway (Part 1). A two-arm signal, a 4-arm bracket signal - Cadwell Down distants, Hitchin Up distant on adjacent Midland line |