National Public Transport Gazetteer

The National Public Transport Gazetteer (NPTG) 
provides a topographic database of towns and settlements in the UK; it provides a common frame of reference for the National Public Transport Access Nodes (NaPTAN) schema and other UK Public Transport Information schemas such as JourneyWeb.
Gazetteers are used for electronic Journey planners to associate stops and destinations with named urban settlements. They are also useful for disambiguating different places with the same name.