
The Potomac River forms the southwestern edge of this landscape, where the Maryland countryside of the early 1900s is organized into a network of numbered districts. Central to the region's economy and growth is the Metropolitan Branch railroad, which links the county seat at Rockville with growing communities like Washington Grove and Gaithersburg. These rail towns contrast with the older agricultural hubs such as Brookeville, Olney, and Laytonsville, which remain anchored by a web of turnpikes and rural roads.
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