Edited sentence: 35 Shannon-Library became the southern portion of 47L Library via Overbrook when Light Rail Vehicles (LRVs) replaced trolleys.36 Shannon-Drake became the southern portion of 42 South Hills Village (excluding the new link from Dorchester to South Hills Village, which was built in 1984).Pittsburgh Railways Interurban Division ran an interurban trolley system linking Pittsburgh with towns in Washington County such as Washington, Charleroi and Roscoe.. The remaining interurban lines were cut back to the Allegheny County border at Drake and Library in 1953.The final portion of the interurban from Dorchester to Drake was renamed 47 Drake, finally closing in 1999 and bringing to an end PCC Streetcar operation in Pittsburgh.They continued to run until the 1980s as routes 35 Shannon-Library and 36 Shannon-Drake