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In page Avonside Engine Company:

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Avonside was a very early British builder of the 4-6-0 type of tender locomotive. Ten narrow gauge freight-hauling 4-6-0 locomotives, weighing from 20 to 25 tons, were supplied to the Toronto, Grey and Bruce Railway and the Toronto and Nipissing Railway. These very successful and reliable wood-burning locomotives pre-dated the first significant British domestic railway 4-6-0, the 'Jones Goods', by over 20 years.