Kent coastline of Kent is continuously changing, due to tectonic uplift and coastal erosion. Until about 960, the Isle of Thanet was an island, separated by the Wantsum channel, formed around a deposit of chalk; over time, the channels silted up with alluvium. Similarly Romney Marsh and Dungeness have been formed by accumulation of alluvium. Kent's principal river, the River Medway, rises near East Grinstead in Sussex and flows eastwards to Maidstone. Here it turns north and breaks through the North Downs at Rochester, then joins the estuary of the River Thames as its final tributary near Sheerness. The Medway is
Buffalo, Rochester and Pittsburgh Railway R&P; this proved to be a bottleneck, and the company which succeeded the Rochester and Pittsburgh Railroad Company, the Buffalo, Rochester and Pittsburgh Railway, built a forty-mile detour, opening it in 1893. While the R&P was expanding on its south side, it also built on the north end. Using the Rochester and Charlotte, the Buffalo, Rochester and Pittsburgh, and the Perry Railroad as construction companies, it brought much greater capability to the old RS&L yard at Lincoln Park and extended its line to the coal pier on the Genesee River at Lake Ontario (Charlotte). Succumbing to over-expansion, the R&P went