Alton and Southern Railway
| Overview | |
|---|---|
| Headquarters | East St Louis, Illinois |
| Reporting mark | ALS |
| Locale | Greater St. Louis |
| Dates of operation | 1913–present |
| Successor | Missouri Pacific Railroad and Chicago and North Western Railway |
| Technical | |
| Track gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
| Other | |
| Website | altonsouthern.com |
The Alton and Southern Railway (reporting mark ALS) is a switching railroad in the Greater St. Louis area in Illinois. It is a wholly owned subsidiary of the Union Pacific Railroad.