The phrase "train wreck" usually refers to a catastrophic event or situation that is entirely out of control. However, there are several synonyms that you can use to describe a comparable disaster. For instance, an "omnishambles" is a situation that has gone horribly wrong in every possible way, whereas a "clusterfuck" implies a tangled and chaotic mess. The phrase "fiasco" is also commonly used to describe a complete and humiliating failure, while a "debacle" is a disaster that involves a lot of public embarrassment. Other synonyms include "disaster" and "catastrophe".