And what does that have to do with managing the employee?It is Amtrak management that has the authority to hire, fire, discipline, counsel and direct the actions of employees in accordance with the contract. That's their JOB!They are responsible for the contract that sets the structure by which employees are managed, disciplined, etc.
TWU values seniority over service and as such sets the tone and culture by which old staff who play the grievance system are the example and those who try to do right by the passenger are the exception. They bargain primarily for more money and rules that work in the interests of preserving the Union.
AFA, on the other hand, is a union focused on enhancing the profession of being a Flight Attendant. Yes, they fight for better wages and working conditions...but a lot of those are safety focused as part of the air travel experience. They partner with the airlines to keep air travel safe for their members and the customers they serve.
The purpose of the union is to protect the employees. If employees use tricks or false claims, then it usually means managers were too lazy or didn't care enough to do things right.
I know an employee at my former company who was going to be fired - and more than deserved it. He told his boss that he'd never get another job and pleaded for a good evaluation and reference and in turn he would resign. The stupid manager was too lazy to do the right thing and did what he was asked, writing a glowing evaluation. The employee took the paperwork and said "Now try and fire me!" and would not resign.