The first copy of the future train MI20 of the RER B was released on Thursday. A symbolic step for this new model, expected for years by the users of the line and supposed to gradually replace the current trains. The regulars of the RER B will perhaps finally see the end of the tunnel. On Thursday, 7 May, Île-de-France Mobilitys announced the factory exit of the first leading car of the MI20, manufactured by CAF in Reichshoffen, Alsace. The trai…