Let me get this straight, Mooney was on Main street when he heard the shots and from there he runs to the railroad yard then hangs for a few seconds and then runs to the depository where he locates the west elevator and then along with two ladies who want to go to the 2nd floor, they all proceed up to the 2nd floor. Mooney then attempts to continue up the elevator but it doesn't work which he attributes to having no power.
So a few minutes after the assassination and presumably just a few seconds after the two ladies had left the elevator after arriving at their floor, Mooney's elevator picks this completely random exact point in time to suddenly stop working, geez what are the chances?
Conclusion.
1. For some unspecified reason the conspirators decided to turn off the elevator many minutes after the assassination.
2. Mooney didn't know how to operate the west elevator which had double gates.
JohnM