We heard from a witness who said, for example, that one of the ways you could actually significantly reduce noise is to bring in a new form of braking system, which is shrink-wrapped and on the shelf right now, and most locomotives and cars don't have that braking system.
If there were unnecessary noise, if a railway was not causing as little noise and vibration as possible and it could be minimized by changing the braking system, could a railway company successfully argue to the agency that operational requirements prevent it from changing its braking system?