The prohibition laid down in the previous article does not apply to the commissaries of the Société Nationale des Chemins de Fer Français and the railway networks under State control provided that :
1. Staff are not obliged to buy from these shops;
2. The employer makes no profit from the sale;
3. The commissary is managed under the supervision of a committee, at least one third of whose members are delegates elected by the employees of these companies;
(4) Every five years, in accordance with the conditions laid down by ministerial decree, the staff shall be consulted on whether or not the said commissaries should be closed.