| Year | 1961 |
| Date | 01-Jun |
| Volume | 124 |
| Issue | 3,125 |
| Page | 685 |
| 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 | Machining of cylinder blocks, valve chests, pistons and valves for 3 1/2 in. gauge |