An NLC covered the station and all of its associated accounting activities; it was on everything from tickets issued from self-service ticket machines to ticket office staff wage slips. Where stations on the same site needed to be treated as separate entities, they were allocated different codes. When London Waterloo's East (serving South Eastern Division destinations) began in the late 1980s to be considered as a separate station from the main London Waterloo (NLC 5598), its self-service machines got their own code, 5158. Revenue could then be apportioned correctly to the relevant Division, and, after privatisation, the correct Train Operating Company (TOC).