We went a couple of years ago, might have been 3.
Everyone enjoyed it, didn't have the premium seats as there were too many of us and couldn't justify the cost.
We hired a minibus and went from Edinburgh to Weardale, had a great time, kids and adults all had new pyjamas and dressing gowns 
It was the last year my DD believed and we still have the bell. Personally I loved it.
I do wish it had been a bit closer to home, hiring the bus made it very expensive, but for the kids it was worth every penny.
On the way home we stopped at Alnwick and went to a chippy/cafe where I had the best spam fritter and chips I've ever had 