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