Not going loopy on the Loop

it's not as bad as it looks.

Enjoying the first run through. Did notice though that after 06:58 the only entry point for trains is from Clinton. Still, makes things a bit less confusing.
Mal.

What fascinates me about that location how it is operated. Does the Towerman (Signaller) operate per timetable or purely on sight?

The next change to Tower 12 came when the Orange Line was being readied for service in the early 1990s. A new switch had to be added to the Tower 12 junction to allow northbound Orange Line trains on Wabash onto the Inner Loop westbound on Van Buren. This new switch was placed in service on April 22, 1993. This presented a new set of alternate routings that would take place at Tower 12 -- northbound Orange Line trains diverging west while northbound Green Line trains continued north -- that would need to be sorted out. It was still desired not to have to staff the tower at all times the Orange Line was operating, so a new set of transponders were installed. This set controlled the northbound routings from Wabash Avenue. The Orange Line trains carried transponders and a receiver was placed north of Roosevelt station. When the receiver detected a transponder, Tower 12 automatically aligned the switches for the Inner Loop. The default route was for the Green Line, which would be set to continue north on Wabash if no transponder was detected. Southbound Orange and Green line trains took the same lineup through Tower 12, so no sorting was necessary there. Southbound Purple Line (Evanston) Express trains did still need to be sorted out, but their transponder system was left disabled and a towerman continued to be assigned during weekday rush periods. The new Tower 12 interlocking, which also controls the diamond crossover south of Tower 12 at Congress/Wabash, was placed in service on March 14, 1994. As part of the new interlocking, a new "tower" was constructed on the east edge of the junction, cantilevered over the corner of Wabash and Van Buren. Actually just a small hut on an elevated platform, the higher location gave the towerman a better view of the approaching lines. The old relay house between the switches where the old tower panel had been remained in place as well.

Tower 12 saw a surge in traffic when the Pink Line service was inaugurated on Sunday, June 25, 2006. Pink Line trains operated clockwise around the Inner Loop and ran during all but owl hours. This meant that for the first time in decades, an "L" line would be taking the Inner Loop-around route at Tower 12 during all day and evening hours. Because of the increased number of trains trough the junction and the need to have a measure of human decision-making when routing trains, especially during rush periods, the CTA began staffing Tower 12 full-time concurrent with the beginning of Pink Line service.