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1843 of Liverpool; at the time of the "railway mania" the partners came together to work on lines and schemes that included the Grand Junction Railway (between Birmingham and Warrington), the Lancaster and Carlisle Railway, the Harrogate Railway, the Runcorn Gap Railway, the Birkenhead and Manchester Railway, and the Aberdeen Railway.
1844 Engineer of lines to be constructed from Lancaster to Carlisle, extension of the London and North Western system, and from Carlisle to Edinburgh, Glasgow, Perth, Forfar on the Caledonian Railway.
1848 Constructed the Caledonian Railway, the Clydesdale Junction Railway, the Scottish Central Railway, the Scottish Midland Junction Railway, and the Aberdeen Railway; consulted about the entire system of railways from Lancaster to Inverness.
1852 Worked on the Shrewsbury and Aberystwyth Railway and the Direct Portsmouth lines.
By 1855 Mr. Errington was Engineer-in-Chief to the London and South Western Railway Company. Projects included Salisbury station, the Barnes and Kew curves; and the branch to Kingston. Prepared Parliamentary plans for London and North Western Railway in Yorkshire and in Derbyshire.
1860 Locke died
1862 Errington died. Julian Horn Tolme and W. R. Galbraith, M. Inst. C.E., who had been two of the principal Assistant Engineers of the firm, entered into partnership for the purpose of continuing the practice.
1869 The partnership of Tolme and Galbraith expired by efflux of time