The Atlanta, Stone Mountain and Lithonia Railway (ASM&L; reporting mark ASML) was a rock quarry railroad that began operations in 1909.
One connected to the "Big Ledge" quarry on the north side of Lithonia, one-half mile (0.80 km) from the Georgia Railroad and the other on a route of about one and a half miles (2.4 km) to the quarries at Pine Mountain on the east side of Lithonia (on tracks that were formerly Pine Mountain Granite Company railroad).
[1] Ownership of the quarries included the Venable brothers and then Davidson Mineral Properties, Inc. of Lithonia, who became the owner of the railroad.
The line was dropped due to competition from other quarries, trucks, alternatives to dimension stone, and the Great Depression.
[1] DeKalb County acquired 400 acres (160 ha) of Arabia Mountain from Davidson Mineral Properties to create a nature park in 1972.