 Network SouthEast thus went from a business unit of around 300 staff to a major business operation with 38,000 staff and a £4.7bn asset value – large enough to be ranked as the 15th-biggest business in the UK.Network SouthEast, like each other sector, was given primary responsibility for various assets (rolling stock, tracks, stations), and control resided with the primary user.Other sectors could negotiate access rights and rent facilities, using their own resources.