RFC North Sea - Med has eight border sections for which two types of procedures exist between the neighbouring infrastructure managers:
These documents provide general information on national rules.
Border section procedures
These technical documents are made for each border section. They give information on the border section itself, such as language to use, communication means, line description and operational procedures.
List of bilateral agreements and border section procedures (including contact details) in Excel format
Priority rules in case of disturbance
For all the countries of the corridor except Belgium, these rules, per country, can be downloaded here. They are also listed on RNE website.
For Belgium, these rules are available in Infrabel's network statement (§4.10)