Previous examples of working in a safety critical environment. Questions about how you would deal with emergency situations.
Brush up with your knowledge of ticketing, Penalty Fares etc.
Standard company info, routes/directors/strategy/govia.
If you're going for Worcester then they are both steady flowing, but fairly easy jobs. If you keep your head down for 1-2 years and do your work properly then promotion is almost guaranteed.
Sundays will be in your working week.