Tangier Protocol of the international zone remained until its 29 October 1956 reintegration with Morocco, following Morocco's independence that year. After it came into force, the Protocol was also acceded to by Belgium, Netherlands, Portugal and Sweden. Tangier Protocol The Tangier Protocol (formally the Convention regarding the Organisation of the Statute of the Tangier Zone) was an agreement signed between France, Spain and the United Kingdom by which the city of Tangier in Morocco became the Tangier International Zone. The protocol was signed in Paris on 18 December 1923 and entered into force with ratification on 14 May 1924. Starting from 1929,
Casablanca–Tangier high-speed rail line train that operated to Rabat, with revenue service planned to begin by the end of the year.<ref name="rg 11/18"></ref> King Mohammed VI named the high-speed service Al Boraq, in reference to the mythical creature that transported the Islamic prophets. The line is constructed in two sections—a new route from Tangier to Kenitra and an upgrade of the existing route from Kenitra to Casablanca. The Tangier–Kenitra line has a top speed of , while the Kenitra–Casablanca line was rated for when service began, with a planned upgrade to . The trackage from Kenitra to Casablanca is planned to be eventually replaced