GWR class Firefly
| GWR class Firefly | |
|---|---|
 |
|
| Number: | 61 |
| Manufacturer: | Various |
| Year of construction (s): | 1840-1842 |
| Retirement: | 1879 (last) |
| Axis formula : | 1 A 1 |
| Genre : | 2-2-2 ( Whyte notation ) |
| Gauge : | 2140 mm or 7 ft ¼ in |
| Fixed wheelbase: | 4,015 mm / 13 ft 2 in |
| Total wheelbase: | 4,015 mm / 13 ft 2 in |
| Top speed: | 58/61 mph or 93/98 km / h |
| Driving wheel diameter: | 2,135 mm or 7 ft |
| Impeller diameter front: | 1,220 mm or 4 ft |
| Rear wheel diameter: | 1,220 mm or 4 ft |
| Cylinder diameter: | 382 mm or 15 in |
| Piston stroke: | 457 mm or 18 in |
The class Fire Fly was a series of broad gauge - steam locomotives with the wheel arrangement 1A1 for express trains of the Great Western Railway .
The Firefly was the first steam locomotive series designed by Sir Daniel Gooch for the Great Western Railway. It was first built in 1840 based on the tried and tested Star GWR class supplied by Stephenson . As a result, 61 more machines of this type were manufactured. In comparative drives, the Ixion belonging to this series proved capable of higher speeds than its standard gauge competitors.
From 1865 the Firefly class was assigned to the Priam Class . The entire series was decommissioned between December 1863 and July 1879 .
A full-size, operational replica of the Firefly has been on display at the Didcot Railway Center since 2005 , where it can travel on a short stretch of broad-gauge line.
literature
- The Locomotives of the Great Western Railway, Part 2: Broad Gauge, The Railway Correspondence and Travel Society, ISBN 0-906867-90-8 .