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Railway signal engineers, of Westminster and Vulcan Iron Works, Worcester
Presumably successor to McKenzie, Clunes and Holland
1884 John Orme Brettell joined the Worcester works
1899 The Westinghouse Brake Co in conjunction with McKenzie and Holland was the first to introduce power signalling into Great Britain with the installation at Bishopsgate Street station on the Great Eastern Railway.
1907 Separate company formed to carry on this business: McKenzie, Holland and Westinghouse Power Signal Co which equipped the whole of the underground railways of London with power operated automatic signalling.