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c.1843 John Stephenson and Co in association with William Mackenzie and Thomas Brassey, offered James Falshaw the charge of the construction of the Lancaster and Carlisle Railway, the contract for which, as a single line, had been taken by the firm.
Mackenzie and Brassey, in conjunction with John Stephenson, constructed the whole of the lines from Lancaster to Edinburgh and Glasgow, under Mr. Locke and John Edward Errington, with their numerous tributary branches and extensions, the Scottish Central to Perth, and the Scottish Midland to Forfar.
In round numbers, the amount of the contracts taken, and of work executed, by Mr. Mackenzie alone, and in conjunction with Mr. Brassey and Mr. John Stephenson, may be estimated at upwards of seventeen millions sterling.