"With the widespread use of computers within British Railways and the advent of national computer systems for dealing with payroll compilation, stores recording and accounting, wagon control, traffic data, revenue and expenditure accounting, market and traffic surveys etc., the need for a standard location code became increasingly important. In order to meet this need, the were asked in November 1966 to revise and update the publication then known as the "Terminals and Mileage Gazetteer Code". At the same time the opportunity was taken to include all sidings, yards, depots, offices, administrative centres, etc., where there is 'railway' activity. [...] A file was developed based on a six-digit code known as the British Railways National Location Code. This was published on 1 January 1968."