There is less uncertainty. I will try to ensure that I am not interpreting what that means for the agency, but the word "unreasonable", according to the way it has been interpreted by the courts and if we were to put ourselves in the shoes of any reasonably informed individual... Is the railway company making as little noise as possible or is it making noise that is unreasonable, more noise than it should be making?
As Mr. Bell said, does the concept of unreasonable noise include implicitly the fact that the railway company must make as little noise as possible? Implicitly, yes. If the railway company does not make as little noise as possible, the noise becomes unreasonable. Since the expression "unreasonable" has been interpreted many times, it is easy to understand the consequential obligation.