The International Wagon Regulations (Regolamento Internazionale Veicoli or Regolamento Internazionale dei Veicoli ) or RIV about the international use of goods wagons in Europe were first agreed between the European railways in 1922.
Nevertheless, the letters RIV continue to stand for goods wagons that are used internationally.
The RIV laid down the technical requirements that a wagon had to meet in order to be used in international service.
Wagons without the RIV designation could be used in foreign countries if they were used on special, pre-agreed, services.
The loading regulations are covered in Annex II of the RIV; the transfer inspection of goods wagons in Volume XII.