The Atlanta, Stone Mountain and Lithonia Railway (ASM&L) (reporting mark ASML) was a rock quarry railroad that began operations in 1909. A "common carrier" railroad it had lines connecting to the Georgia Railroad and primarily served granite and gneiss quarries at Lithonia and at Stone Mountain in DeKalb County. It operated 4 miles of track from Lithonia, Georgia, to a quarry near Rock Chapel, Georgia. Notes on the line say it ran from "Lithonia to Georgia Railroad. Davidson Granite Company, Northeast of Lithonia".