This locomotive, along with Charles Tayleur's Vulcan was delivered by canal to West Drayton on 25 November 1837. It had 14.5-by-14.5-inch (368 mm × 368 mm) cylinders. The name, which means "first", was later used on the first locomotive built at Swindon, the first of the Premier Class goods locomotives.
Ariel (Mather, Dixon 41; 1838 - 1840)
This locomotive was the second of the Mather, Dixon locomotives to arrive and featured 14-by-14-inch (356 mm × 356 mm) cylinders. Ariel is, amongst other things, an angel and a fairy in William Shakespeare's The Tempest.
Ajax (Mather, Dixon 50; 1838 - 1840)
This rather distinctive locomotive had plate 10ft wheels instead of the more usual spoked ones, the carrying wheels being 5ft. The 14-by-20-inch (356 mm × 508 mm) cylinders were fed from a doubled-domed boiler. It was named after Ajax, a hero in Greek mythology.
Planet (Mather, Dixon 51; 1839 - 1840)
This locomotive was delivered in December 1838 before being put to work in August 1839. After withdrawal it was used as a stationary boiler at Reading. The planets at this time were all named after mythological gods.
Mercury (Mather, Dixon 52; 1839 - 1843)
This locomotive was built to similar dimensions to Planet and also arrived in December 1838 but not accepted into service until 26 September 1839. It had 8ft driving wheels and 16-by-20-inch (406 mm × 508 mm) cylinders. It was named after Mercury, a Roman god; the name was later carried by one of the Ariadne Class standard goods locomotives.
Mars (Mather, Dixon 53; 1840 - 1840)
This locomotive was built with 10ft wheels, but did not enter service until they had been changed to 8ft ones. The cylinders were 16 by 20 inches (406 mm × 508 mm). It was not successful, being delivered in April 1840 and withdrawn in December. It was named after Mars, the Roman god of war; the name was later carried by one of the Ariadne Class standard goods locomotives.