The Firefly was a class of broad gauge 2-2-2 steam locomotives used for passenger services on the Great Western Railway. The class was introduced into service between March 1840 and December 1842, and withdrawn between December 1863 and July 1879.
Replica of the Great Western Railway Gooch 7 foot gauge "Priam" Class, or “Firefly” Class 2-2-2 "Fire Fly”.
GWR Firefly replica at Didcot Railway Centre
A broad-gauge railway is a railway with a track gauge broader than the 1,435 mm used by standard-gauge railways.
Great Western Railway broad-gauge steam locomotives awaiting scrapping in 1892 after the conversion of the tracks to 4 ft 8+1⁄2 in (1,435 mm) standard gauge.
A replica GWR Firefly Class broad gauge steam locomotive, with a preserved, standard-gauge GWR railcar, Didcot Railway Centre, 2009
Irish 5 ft 3 in (1,600 mm) broad gauge tracks
Broad gauge track for CSIRO Australia Telescope in Narrabri