| Year | 1952 |
| Date | 15-May |
| Volume | 106 |
| Issue | 2,660 |
| Page | 635 |
| Category | Locomotive |
| Part | |
| Title | "Britannia" in 3 1/2-in. Gauge |
| Author | LBSC |
| Notes | Details of the Reversing Screw. Reversing nut, combined lifting and reversing arm, lifting linkd, return cranks, eccentric-rods |