The Reaching Across Illinois Library System (RAILS) is one of two multitype regional library systems in the state. The membership of RAILS includes academic, public, school, and special libraries.

RAILS provides delivery service to support Illinois’ vast interlibrary loan program, technology support for more than 600 libraries’ shared online catalogs, and Talking Book Services that serve persons with visual or physical disabilities who cannot read conventional print material.

The RAILS service area covers northern and western Illinois. The system serves more than 1300 private, public, school, and university library members, representing more than 4200 library facilities in a 27,000 square mile area. Although the city of Chicago is within RAILS' boundaries, and a number of RAILS member libraries are located in Chicago, the Chicago Public Library constitutes a separate library system.