All cars in interchange service in North America must appear in Umler. This is an electronically accessible file containing each car’s physical data, economic data, and certain periodic test data. Maintaining accurate and timely data allows for the smooth and efficient interchange of equipment throughout the North American railway system. Information contained in Umler is also used as a tool to validate car repair billing data during the audit process. Data that is required for new or newly acquired equipment will be collected and submitted by RAS electronically through Railinc. Maintenance of data for all existing equipment will be performed in the same manner.