This paper describes the evolution of the original Air Supply Units as oil-lubricated piston compressors to the new range of Knorr-Bremse Oil-Less Piston Compressors. These compressors will provide reliable, cost-effective, operation in a railway environment. The design features of the Oil-Free Piston Compressor are described and the operational advantages over conventional oil-lubricated reciprocating compressors are highlighted.

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