GWR Sun Class

Alongside his Firefly orders, Gooch specified a parallel batch of 21 smaller-wheeled 2-2-2s for branch-line passenger and stopping-train work where the 7 ft Fireflies were unnecessarily large. The Sun class shared the Firefly's general layout but with 6 ft 0 in driving wheels and a slightly shorter wheelbase.

The Suns worked GWR secondary services from 1840 onwards. Like other Gooch broad-gauge engines they were rebuilt with larger boilers in the 1860s and lasted until the gauge conversion in May 1892. None preserved.

Broad-gauge 2-2-2 with 6 ft 0 in drivers, otherwise visually similar to the Firefly class.

• Sun, Aurora, Comet, Meteor (1840–42, not preserved)