Opinion of the Commission pursuant to Article 251(2), third subparagraph, point (c) of the EC Treaty on the European Parliament's amendments to the Council's common position regarding the second railway package with a view to the adoption of a Directive of the European Parliament and of the Council amending Council Directive 91/440/EEC on the development of the Community's railways - amending the proposal of the Commission pursuant to Article 250 (2) of the EC Treaty