page_title: South African Class 19C 4-8-2
section_title: Watson Standard boilers
hierarchical_section_title: South African Class 19C 4-8-2 / Characteristics / Watson Standard boilers
caption_attribution_description: English: A.G. Watson, South African Railways Chief Mechanical Engineer (1929-1936)
context_page_description: The South African Railways Class 19C 4-8-2 of 1935 was a steam locomotive.
  In 1935, the South African Railways placed fifty Class 19C steam locomotives with a 4-8-2 Mountain type wheel arrangement in service. It was the first South African locomotive class to use rotary cam poppet valve gear and also the first to be built new with a Watson Standard boiler.
context_section_description: Soon after A.G. Watson was appointment as CME in 1929, he set out on a program of standardisation of locomotive boilers and engine parts which ultimately led to a considerable reduction in the time taken for locomotive repairs. At the time, 88 different types of locomotive were in service, for which some fifty types of replacement boiler were still being ordered prior to 1929.
  The Class 19C was the first to be built new with Watson Standard boilers. The no. 1A boiler had a larger superheater than the Class 19B. In a break with prior custom, the ash pan and running boards were affixed to the locomotive frame instead of to the boiler to facilitate easier removal of the boiler for repairs. The Class 19C was also built with Watson's altered cab with a slanted front to facilitate access to the firebox stays on the sides ahead of the cab. The Watson cab, like the Watson Standard boiler, was to become standard on later SAR steam locomotive classes.
  The first five Watson Standard boilers to be designed were the numbers 1, 1A, 2, 2A and 2B. The no. 1 boiler was suitable for the Classes 5, 5B, 10A, 10B and 10C locomotives. The no. 1A boiler was similar to the no. 1, but with the boiler barrel lengthened by 2 feet 5 inches (737 millimetres), and was suitable for the Classes 19, 19A and 19B. Like the Class 19C, the Class 19D would also be built new with no. 1A boilers.
  The no. 2 boiler was suitable for the Classes 3, 3B, 4A, 12, 12B, 14, 14A and 14C locomotives. The no. 2A boiler was similar to the no. 2, but with the boiler barrel lengthened by 2 feet 4 inches (711 millimetres), and was suitable for the Classes 15, 15A and 15B locomotives. The no. 2B boiler was also similar to the no. 2, but with the boiler barrel shortened by 1 foot (305 millimetres), and was suitable for the Classes 16, 16B and 16C locomotives.
  These were later followed by the numbers 3A and 3B boilers. The no. 3A boiler was suitable for the Class 16E locomotive, while the no. 3B boiler was 3 feet 5 ¹⁄₂ inches (1,054 millimetres) longer and suitable for the Classes 15E, 15F, 21 and 23 locomotives.
caption: A.G. Watson
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