Central City, Kentucky bituminous coal underlying the bedrock. Central City has a number of old underground coal mine shafts that still crisscross the city. Most of these old shafts date back to the early 1900s. The majority of terrain around the city limits is reclaimed land where surface mining has taken place. As of the census of 2000, there were 5,893 people, 2,065 households, and 1,410 families residing in the city. The population density was 1,126.2 people per square mile (435.0/km). There were 2,313 housing units at an average density of 442.0 per square mile (170.8/km). The racial makeup of the city was
History of the London Underground early years of the 20th century, UD signs appeared outside stations in central London. World War I delayed extensions of the Bakerloo and Central London Railways, and people used the tube stations as shelters during air raids in 1915. After the war, government-backed financial guarantees were used to expand the network, and the tunnels of the City and South London and Charing Cross, Euston and Hampstead Railways were linked at Euston and Kennington, although the combined service was not named the Northern line until later. The Piccadilly line was extended north to Cockfosters and took over District line branches to