This region saw significant industrialization, with the first pig iron to be smelted at Mount Savage, Maryland to the northwest by the Maryland and New York Coal and Iron Company. Coal mining began in Eckhart Mines after "The Big Vein" was opened in 1820. The coal was originally transported by flatboats placed together on the headwaters of the North Branch Potomac River. As part of its operations, the company built the Potomac Wharf Branch rail line from Wills Creek, west of Cumberland, between 1846 and 1850, as an extension to its Eckhart Branch Railroad.