Hello, it was many years ago since I had mine, but the questions will probably have a similar focus on safety and customer service.
Try to think of examples you can give where you went the extra mile, delt with a difficult customer, had to work alone or within a team, communicate effectively.
It also helps to read over the job description so you know what exactly is expected of you, and find out a little about the company as they may ask what you know.
They'll be looking for a calm, professional person who can work well under pressure and be a good ambassador for the company. Which station did you apply for?
Best of luck!