According to the invention there is provided a liquid friction control
composition characterized as either having a high and positive friction characteristic
or a low and neutral friction characteristic, comprising a retentivity agent. The
liquid friction control composition may also comprise other components such as
a solid lubricant, a wetting agent, a consistency modifier, and a preservative.
The liquid friction control compositions may be used to modify the interfacial
friction characteristics in sliding and rolling-sliding contact such as steel wheel-rail
systems including mass transit and freight systems.