The original 14-by-15-inch (356 mm × 381 mm) cylinders were replaced from 1844 by larger 14-by-18-inch (356 mm × 457 mm) or 15-by-18-inch (381 mm × 457 mm) ones.
Locomotives
Lion (Sharp, Roberts R; 1838–1847)
Atlas (Sharp, Roberts S; 1838–1872)
This locomotive was rebuilt as a 2-2-2T tank locomotive in 1860. After it was withdrawn it was sold to a Mr Glasbrook in Swansea. It was named after Atlas, a Greek Titan.
Eagle (Sharp, Roberts T; 1838–1871)
This locomotive was rebuilt as a 2-2-T tank locomotive in 1860.
References
Reed, P. J. T. (February 1953). White, D. E. (ed.). The Locomotives of the Great Western Railway, Part 2: Broad Gauge. Kenilworth: RCTS. pp. B10 –B11. ISBN0-901115-32-0.
Waters, Laurence (1999). The Great Western Broad Gauge. Hersham: Ian Allan Publishing. ISBN0-7110-2634-3.