It was just one behavioral interview. Knowing Wabtec values is a plus, and being able to answer the questions well too. Be yourself, be confident. Don't give them any sign of incompetency. If you are not sure of a question, feel free to say " Can you give me three minutes to think about my answer?" They'l most likely say yes and when they do, don't get nervous just keep thinking until you're ready to answer. If you are still not ready, you can tell the interviewer to move on to the next question and come back to the previous one later.