Curve squeal is a major impact from rail operations on tight curves through residential areas. TfNSW has embarked on an intensive study into curve squeal and this paper presents an overview of that study. We have taken a holistic approach by considering each of the key contributors to wheel squeal: rolling stock, the wheel/rail interface, and the trackform. This paper will report on the results of trials, measurements and research into each of these areas, including (1) measurement and analysis methods for identifying/classifying curve squeal. This includes how squeal is identified from wayside noise measurements, a means of determining which wheel is squealing and which wheel/rail contact area is involved. (2) Which rolling stock is causing squeal and why. This includes a discussion of wagon steering behaviour based on measurements from wayside systems, the difference in performance between wagon classes and designs, and what this means for squeal noise generation. (3) Management of the wheel/rail interface for mitigating curve squeal. This includes a discussion of the importance of rail profile and friction management and provides results from on-track testing.