NaPTAN is Britain's national system for uniquely identifying points of access to public transport. It is a core component of the national transport information infrastructure and is used by a number of other UK standards and information systems.

There is a NaPTAN record for every bus stop, railway station, airport, ferry terminal etc. in England, Scotland and Wales. Record attributes include co-ordinates (OSGR and Lat-Long), NPTG locality reference, name components and SMS code. 

Please note

Leeds identifiers are:

• Prefix as character - LDS
• Prefix as number - 537
• Mnemonic - Leeds
• Admin Area - West Yorkshire
• ATCO code - 450
• Traveline region - Yorkshire

For further on NaPTAN schemas, please visit https://www.gov.uk/government/publications/national-public-transport-access-node-schema