sentences:  In the mid-nineteenth century, the arrival of the Great Northern Railway (GNR) cleaved Harringay from the rest of its ancient borough.The subsequent arrival of the Tottenham and Hampstead Junction Railway (THJR) almost defined its present-day southern boundary.Harringay's development in the late nineteenth century was of a markedly different nature from what occurred to the west of the GNR and to the south of the THJR.