The South African Class 1B 4-8-2 of 1904 is a South African steam locomotive from the pre-Union era in the Natal Colony.In 1904 the Natal Government Railways placed fifty Class B locomotives with a 4-8-0 Mastodon wheel arrangement in service. Of these six were modified in 1906 to Altered Class B locomotives the first in the world with a 4-8-2 Mountain wheel arrangement. In 1912 when those six were assimilated into the South African Railways they were renumbered and classified as Class 1B.
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