From an online source, regarding Southwest Chief train 3(25):
The train was delayed 45 min. at initial terminal for repair of a badHEP cable on the baggage car. Consist had arrived late as Train 29 and
apparently CHI Mechanical hadn't gone over it as thoroughly as they
would like to think. The staff in the Met Lounge was told to have the 28 First Class Sleeping Car passengers wait there, to be sent to the departure gate upon notification that the repairs were done. But nobody ever notified them and the passengers were still in the Met Lounge when the train pulled out.