(11)The entry into force of Directives 2001/12/EC of the European Parliament and of the Council of 26 February 2001 amending Council Directive 91/440/EEC on the development of the Community's railways 6, 2001/13/EC of the European Parliament and of the Council of 26 February 2001 amending Council Directive 95/18/EC on the licensing of railway undertakings 7 and 2001/14/EC of the European Parliament and of the Council of 26 February 2001 on the allocation of railway infrastructure capacity and the levying of charges for the use of railway infrastructure and safety certification 8 has had an impact on the implementation of interoperability. As in the case of other transport modes, the extension of access rights must be accompanied by the requisite harmonisation measures. It is therefore necessary to implement interoperability on the whole network by extending progressively the geographical scope of Directive 2001/16/EC. It is also necessary to extend the legal basis of Directive 2001/16/EC to Article 71 of the Treaty, on which Directive 2001/12/EC is founded.