Finally in 1844 it built the Erewash Valley line as far as Pinxton in 1847, with a link to the Butterley Company's own railway at Codnor Park in 1849.
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By the end of the century, it was also carrying main-line expresses from London to Leeds and Settle and Carlisle Line services to Scotland, while the main line to Derby served the expresses to Manchester, and the main line to Nottingham used the Corby line from Kettering and ran through the now closed Old Dalby line diverting near Melton Mowbray.
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The service used the Midland Main Line as far as Trent Junction, before taking the Erewash Valley Line (avoiding Derby) to Clay Cross, rejoining the Midland Main Line until Dore South Curve, before heading west along the Hope Valley Line towards Manchester Piccadilly.