Artikel 27

As regards sums which a railway has paid to its users, the matters to be dealt with in arrangements between railway administrations are, more particularly, the following:
(a) Regulations regarding the right of recourse of an administration which has paid compensation against other administrations taking part in the carriage;
(b) Provisions determining the responsibilities of the different administrations or the responsibilities which they agree to share;
(c) Provisions dealing with the recourse of administrations against each other in the case of one of them deciding to refund a sum levied in excess of the amount due to the railway (overcharge);
(d) Rules as to the recognition by the administrations of a judgment which has been given against one of them obliging it to make a payment.