The Chicago 'L', short for 'elevated', was an innovative transportation solution that began operations in 1892. It marked the first extensive elevated rail system in the United States, transforming urban transit and setting a precedent for future cities. The first segment opened on June 6, connecting downtown Chicago to the Near Northwest Side, addressing the increasing demand for efficient public transportation as the city's population continued to grow. With construction starting in 1890, the 'L' was designed to ease traffic congestion on the streets below and to provide affordable travel options for everyday commuters.

Initially powered by steam locomotives, which traveled on elevated tracks above the busy streets, the Chicago 'L' offered a new perspective for city dwellers, allowing them to traverse long distances without the hassle of street-level traffic. The design of the rail system included multiple routes, with the trains operating at high frequencies to cater to the needs of the public. The introduction of this transit option not only improved mobility but also spurred economic development and urban growth along its routes.

As the system expanded in subsequent years, it continued to influence urban planning and infrastructure development in Chicago and beyond. Its success led other cities to adopt similar elevated or light rail systems, paving the way for modern public transportation frameworks. The combination of convenience, speed, and access marked the Chicago 'L' as a pivotal chapter in the evolution of urban transport solutions.