We consider it effective. The interswitching rules are beneficial not only because the companies have the right to use them and can ask the agency to participate in discussions to ensure that they have access to them. That also has an impact on market conditions. If the rail companies know they can give access to their rights, that has an impact on negotiations. In that case—and these things are expected informally only—it creates a more effective climate for negotiations between carriers and clients.
Evidence of meeting #21 for Transport, Infrastructure and Communities in the 42nd Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was interswitching.
A recording is available from Parliament.