A private railroa car, private railway coach, private car or private varnish is a railroad passenger car which was either originally built or later converted for non-revenue service as a business car for private individuals. A private car was added to the make-up of a train, providing splendid upholstered privacy for its passengers. They were used by railroad officials and dignitaries as business cars, and wealthy individuals for travel and entertainment, especially in the United States. They were sometimes used by politicians in "whistle stop campaigns".