Translate the following English sentence to French:
"What, however, is at least as important in terms of this change is that coordination should also be achieved within the operational and administrative systems, that staff should be duly trained and that there should be agreements in place to enable drivers to take trains across the national borders."
Cependant, il est au minimum tout aussi important que le même travail soit mené sur le plan de l'administration et de l'exploitation, que le personnel y soit préparé et que des accords soient mis au point pour le passage des frontières.