roll movement compensation
([Bombardier, TWINDEXX A New Era in Rail Travel, 2013-05-29, Internet](http://www.bombardier-transportation.ch/dateien/dokumente/111001_BR_TWINDEXX_en.pdf))
The roll movement compensation (WAKO) mechanism integrated into the BOMBARDIER* FLEXX* Tronic WAKO* bogie enables trains to reach higher speeds on curves, resulting in shorter journey times and the ability to deploy more frequent trains.
USG: frequently used short form