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
Headcorn and Maidstone Junction Light Railway worked by class 08 and 09 shunters, the bridge being deemed unsafe for anything heavier. The line was long and it closed to traffic on 3 October 1977. After closure the bridge over the river was removed and the site of the goods station is now covered by housing. Headcorn and Maidstone Junction Light Railway The Headcorn & Maidstone Junction Light Railway was a proposed railway in Kent. An Act of Parliament authorised its construction, but only a short branch at Tovil, opened to goods only, was built. Maidstone, the county town of Kent, had been reached by the railway