I had one years ago, I can remember it was safety focussed, asking me to talk through a station and what would be a risk to people, what to look out for to keep people safe etc.
Another one about handling passenger queries and when have I worked with the general public. How can I travel to work outside of public transport hours. I'm sure someone else will have done one more recently, this was in 2016.
I can't imagine its too disimilar, just think about being customer focussed, safety focussed, the company values. They have all the info on their website such as their core values, the fleet size, stations they call at, the amount of employees, where they operate to etc, that's all stuff that you would be expected to know.
Hope this helps.
