September 2, 2018 – A Chicago Transit Authority Rapid transit “L” train passes through the tower 18 interlocking in downtown Chicago, Illinois. For decades, the Tower 18 junction at Lake & Wells has been billed as one of the busiest railroad junctions in the world. – #jimstrainphotos #illinoisrailroads #trains #nikond800 #railroad #railroads #train #railways #railway #cta #commutertrains