One of two repeater panels showing the alignment of the Toh Jct turnouts (magnified several times - evidence of cell phone photo).
The parellel horizontal lines on the left represent the inner and outer tracks on the helix. red LEDs show the progress of trains up and down the helix.
Crews that really want to see their train's progress can bend over and take a look. However bending over sucks and the view is obstructed here and there by benchwork joists. Watching the LEDs is mucht easier. The sound of rolling wheels or the growling of a loco's gears also give crews a clue as to whether their train is still moving.