Start with the signals facing 90 degrees away from the track.
Either new signals not yet working, or old signals waiting removal or change over to other controls.
Either way, the signals didnt work, and one of the GCOR and the eastern rules is,
Any signal not displaying any aspect, or a dark signal, should be treated as a absolute stop signal.
At least two rules cover this, GCOR rule 5.15, Improperly Displayed Signals, which reads;
If a signal is improperly displayed, or a signal flag, or sign is absent from the place it is usually shown, regard the signal as displaying the most restrictive indication it can give.
However, if a semaphore arm is visable, it will govern.
And rule 9.4, Improperly Displayed Signals or Absent lights, which reads:
Except as shown in block, cab, and interlocking signals aspects in the special instructions, if a light is absent or a white light is displayed where a colored or lunar light should be, regard a block or interlocking signal as displaying the most restrictive indication is can give.
However, when the semaphore arm position is plainly seen, that aspect will govern.
These rules keep trains from running a signal that has malfunctioned or has a burned out bulb.
If a crew comes up on a signal that they know should show a aspect, and it dosnt, they have to stop, so the signal dept turns old, no longer used signal heads away from the track, so the crews know the signal is not in service.
As for the 5 crews on five different units.
I am making a assumption, that they were not all MUed to each other, but five seperate MUs or single units.
All at one end of a yard, right?
If so, you most likely were watching crews that had dropped off trains, or were picking up trains after making a transfer, all waiting to be staged back out, or in line to get back to their respective “home” yards.
Some of them might be wait