As @GlacierGlacier mentioned the bullwheel is now covered, so the cable is as well. If these panels are not removed for cable installation then they'd have to go around and above the concrete pylon to put the cable on the bullwheel through the current opening. The alternative would be to pull in one end through the opening near one of the converging rails (blue scenario below).
The first pic shows you where the bullwheel is located w.r.t. to the pylons. I drew the bullwheel in red on the second pic, along with where the cable will end up (green), and the open access that's left now as far as I can tell (yellow). To get from yellow to green without removing the panels seems complicated because of all the components under the roof and the concrete pylon. The other option would be to pull one end of the cable in following the blue arrow, and then laying it in place from above.
To my untrained eye both the yellow and blue scenarios appear more complicated than laying the cable on the ground the way it's suppose to go in and then lifting it to where it needs to be, but the bottom covers are now preventing that. View attachment 293327View attachment 293328
I assume they pull it through like threading a needle. There are probably guides above and below that prevent lifting an entire loop all at once and then tightening. Threading it like a needle through the normal path eliminates any of those concerns, sine you just have one end.
I’m more fascinated by how they join the two ends to create a loop. I’ve never noticed any special spots on lift ropes before. It’s probably not obvious though.
I wonder if these drawing indicate the direction will be clockwise. Based on the paths for loading and unloading in the stations.