Water lubrication used in new roller coaster

link:  http://www.interpark.co.uk/news/2291/landmark-water-coaster-to-open-in-june/

In developing a new slide for an upcoming theme park in Waterloo, Iowa, ProSlide taking advantage of water to solve lubrication issues.  Water is a readily available fluid although its propensity to cause oxidation and relatively poor lubricating properties mean that it is not commonly used as a lubricant.  Nevertheless, it can be useful as a lubricant under in some applications.