The Great Western Railway originated from the desire of Bristol merchants to maintain their city as the second port of the country and the chief one for American trade. The increase in the size of ships and the gradual silting of the River Avon had made Liverpool an increasingly attractive port, and with a Liverpool to London rail line under construction in the 1830s Bristol's status was threatened. The answer for Bristol was, with the co-operation of London interests, to build a line of their own; a railway built to unprecedented standards of excellence to out-perform the lines being constructed to the North West of England.[4]