Northumberland role in the Industrial Revolution from the 18th century on. Many coal mines operated in Northumberland until the widespread closures in the 1970s and 1980s. Collieries operated at Ashington, Bedlington, Blyth, Choppington, Netherton, Ellington and Pegswood. The region's coalfields fuelled industrial expansion in other areas of Britain, and the need to transport the coal from the collieries to the Tyne led to the development of the first railways. Shipbuilding and armaments manufacture were other important industries before the deindustrialisation of the 1980s. Northumberland remains largely rural, and is the least-densely populated county in England. In recent years the county has
Cheltenham Township, Montgomery County, Pennsylvania Glenside Free library. Cheltenham is officially twinned with their namesake, Cheltenham, England. There are also five other places in the world named "Cheltenham." Cheltenham Township, Montgomery County, Pennsylvania Cheltenham Township is a home rule township bordering North Philadelphia in Montgomery County, Pennsylvania, United States. Cheltenham's population density ranges from over 10,000 per square mile in rowhouses and high-rise apartments along Cheltenham Avenue to historic neighborhoods in Wyncote and Elkins Park. It is the most densely populated township in Montgomery County. The population was 36,793 at the 2010 U.S. Census, making it the third most populous township in Montgomery County and