Translate the following English sentence to French:
"If a clear split is not made between the trains operated by the railway companies on the one hand and the management of railway infrastructure on the other, the objective of this directive will be seriously undermined."
Si aucune distinction nette n'était effectuée entre les services de transport des compagnies ferroviaires, d'une part, et l'exploitation de l'infrastructure d'autre part, l'objectif de cette directive serait sérieusement remis en question.