GWR Thunderer locomotive

GWR Thunderer

Type and origin Power type Steam Designer T. E. Harrison Builder R. & W. Hawthorn & Co. Serial number 235 Build date 1838 Total produced 1

Specifications Configuration 0-4-0+6 Gauge 7 ft (2,134 mm) Driver diameter 6 ft 0 in (1,829 mm) Wheelbase 7 ft 0 in (2.13 m) Cylinder size 16 in × 20 in (406 mm × 508 mm)

Career Operators Great Western Railway Number in class 1 Withdrawn 1839 Disposition Scrapped

Thunderer was the first of a pair of locomotives (the other being Hurricane) built for the Great Western Railway (GWR), England, by R. & W. Hawthorn & Co. whose design was very different from other steam locomotives. In order to meet Isambard Kingdom Brunel's strict specifications, an 0-4-0 frame carried the 'engine', while the boiler was on a separate six-wheeled frame. The driving wheels were geared 10:27 in order to reduce the cylinder stroke speed while allowing high track speed, in line with the specifications.

The locomotive was delivered to the GWR on 6 March 1838 and ceased work in December 1839 after running only 9,882 miles, but its boiler section was kept as a stationary boiler.

See also

• GWR Hurricane locomotive - the second Hawthorn locomotive
• GWR Haigh Foundry locomotives - further geared locomotives