Sleeper Train Paris to Madrid

I have booked us on a sleeper train from Paris to Madrid. We get on the train at 7pm and off at 9am. when we cross the border between france and spain the rails change distance apart and the train has to adjust. It will be interesting. We have a 'room' for 4 and a 'room' for 2. Seth is paying a little extra for a little privacy. More to come later.....