POV: You’re riding on a CTA Brown Line train and pass through Tower 18 Interlocking 🚈 Often referred to as “the busiest railroad junction in the world,” Tower 18 Interlocking is responsible for the safe passage of trains on the CTA’s Brown, Green, Orange, Pink and Purple Lines as they navigate the Loop. The tower structure seen in this video is the third version to exist here. The first was built in 1900 (as far as I can ascertain), the second in 1969, and this one in 2010. There’s an immense a

CTA Brown Line trains are seen crossing the North Branch of the Chicago River between Rockwell and Francisco Stations on a sunny winter morning in Chicago, Illinois. The inbound and outbound CTA trains are traveling over the at-grade portion of the Brown Line that runs (from east to west) between Rockwell and the terminus of the Brown Line at Kimball. The trains consist of a mixture of 2600-series cars and 3200-series cars. | Trainiac Productions

A Kimball-bound CTA Brown Line train descends down to grade level after departing Western Station on the sunny morning of November 2, 2025. Operating as an elevated route from the Loop to Western, the Brown Line lowers to ground level between Western and Rockwell Stations. It then remains at-grade through the Francisco and Kedzie stops and in to its terminus at Kimball. | Trainiac Productions