| Year | 1961 |
| Date | 10-Aug |
| Volume | 125 |
| Issue | 3,135 |
| Page | 178 |
| Category | Locomotive |
| Part | |
| Title | "Firefly", a GWR 4500 class 2-6-2 tank engine in 3 1/2, 4 3/4 and 5 in. gauges |
| Author | Martin Evans |
| Notes | Valve gear details for 5 in and 4 3/4 in gauges. Securing the bearing |