Sharp, Stewart and Company
Two more were ordered from Neilson, Reid in 1903, numbered 5 and 6, but since three Scottish locomotive builders (Dübs and Company, Neilson, Reid and Sharp, Stewart and Company) merged into the North British Locomotive Company (NBL) while the locomotives were being built, they were delivered as having been built by the newly established NBL at the Hyde Park works of the former Neilson, Reid.