The Traveline National DataSet (TNDS) is compiled from data sourced from the English Traveline regions, Traveline Scotland, and Traveline Wales. TNDS contains public transport timetables for bus, light rail, tram and ferry services in Great Britain. Each Traveline regional supply of data has been formatted in a slightly different way from the others. To ensure a consistent output, the process involves importing the Traveline regional data supplies into a database. The TNDS is then exported in both TXC v2.1 and TXC v2.5 using the same data elements and the same format for all files respectively.