There is like a step ladder along the rail on the outside (link 2 pic 1), maybe one step for 20" or 2feet. Not very practical for the customers.
The firefighters seems to came from the top of the mast ( pics 4 and 7). You can see there a steel platform just beside the step ladder's top and a man hole a little farther to the right. I bet there's an other ladder inside the mast, and probably an elevator to get to the machinery room on top (pic 9). But for the midway trapped visitors, I suppose that it was as much impractical to reach than the ground.
