Thanks for this latest picture! Emergency doors often are "different but similar" to their big-brother main door. I like the two arrows that line up to show the locking lugs are aligned for closure. There are pins in the door like those in the main door. Both halves of the alarm contact can be seen. No surprise there is a beefy door stop. A data plate of some sort is on the lower hinge that has been painted over, demonstrating that this was not the original paint (if it was even painted at all in the first place). Was the central area was originally glass, replaced with metal at a later time when the glass broke?

All that dust makes me wonder if the door has even been closed recently. The greasy appearance of the door frame makes me want to grab that can of WD-40 and do some cleaning.