TGV trains in France have a very strict structure. For the TGV atlantique lines, for example, "short" trains contain exactly 10 cars (and "long" trains are comp

TGV trains in France have a very strict structure. For the TGV atlantique lines, for example, "short" trains contain exactly 10 cars (and "long" trains are composed of two "short" trains), with the following distribution: - Car 1 and 10 are engines, and include some second class seats. - Cars 2 and 3 are first class. - Car 4 is the bar-restaurant. - Car 5 is first class. - Cars 6, 7, 8 and 9 are second class. All the infrastructure is designed to treat the train as a single unit, during all operations at the shunting yard, in repair workshops, and son on. And the position of toilets (including special toilets for nappy changes) is fixed.