The interview itself isn’t anything out of the usual. The tests however, can be harder!
There were twenty of us. We started with a maths paper, after which those who didn’t get the pass required were politely asked to go.
Then an English test, and the same thing.
Then a ticket-test where they give examples and you have to work out fares & if tickets are valid.
Then a “group exercise” and the same thing. In the end they only actually interviewed three of us.
That was a few years ago & things may have changed, particularly in these Covid socially-distanced times.