Chicago Surface Lines
| Overview | |
|---|---|
| Dates of operation | 1913– 1947 | 
| Successor | Chicago Transit Authority | 
| Technical | |
| Track gauge | 4 ft 8+1⁄2 in (1,435 mm) | 
The Chicago Surface Lines (CSL) was operator of the street railway system of Chicago, Illinois, from 1913 to 1947. The firm is a predecessor of today's publicly owned operator, the Chicago Transit Authority.