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I've seen the Hyerotrope, crossed to the Pillar Section, and opened the crack leading to the three corridor rooms with the steel bar.

I don't know what to do with the dark spots on the walls of the Corridor. I don't know what to do with the Hyerotrope, although I'm pretty sure I can't activate it or enter it yet. Also, I flipped a switch at the Abandon Warehouse, but I don't know what it did, and it can't be unflipped.

You're carrying a steel bar, a new railway ticket, some Report files and an E-Pad.

You're right that you've got to do something with the spots. It doesn't look like you've got the right thing in your inventory. It looks like you've missed something in the Broken Wagon location.

Rails’ End
These are the remains of the tunnel which would have taken you to the
University if the quake hadn’t swallowed its walls. Cascades of dirty water
wash the sides of the black pit, flowing towards the giant crack. The fiery
curtains of orange smoke that originate a few meters from you are the
only light source for a span that goes on for kilometers. A thick web of
twisted rails cuts its way across the darkness to the southwest. A small
gap in the hulking walls of the tunnel leads north towards the unknown.
Then it’s only concrete and stone and a shattered world tangling together
in every direction.

I have the elektron, found the quartz shard to power it. From the Featureless Corridor, I found two regions -- the pyramid room with the frozen spike, where there's some kind of cylinder stuck in the ceiling, and the lab area, where I found the alpha and beta discs and saw the talon and the diagram on the terminal.

I think I need to activate the hyerotrope. I notice that the dots on the cylinder in Cold Pyramid look like the dots on the hyerotrope's door. I had hoped connecting the elektron to the cylinder and then touching the display would have some affect, but I didn't notice any. I wish I could dislodge the cylinder from the ceiling.

There are four dots on the hyerotrope, and there are four discs that you can find in the game. Each time you do some special thing to one of those discs, a dot will light up on the hyerotrope. When all the dots have lit up, you should be able to enter the hyerotrope.

Examine the discs, examine the cylinder.