 On January 2, 1991, Knorr-Bremse acquired New York Air Brake's rail braking business from General Signal, however, they did not purchase Stratopower, or Dynapower.Knorr-Bremse is a maker of braking systems for rail and truck vehicles.By the end of 1993, NYAB stopped manufacturing the Westinghouse brake in favor of Knorr-Bremse's improved DB-60 air brake featuring poppet valve technology.