In preparation for full privatisation, BR was split up into various parts. Provision of passenger services was split up into twenty-five passenger train operating units (TOUs), known as shadow franchises, split by geographical area and service type. For freight services, six freight operating companies (FOCs) were created - three geographical units for trainload freight (Mainline Freight in the south-east, Loadhaul in the north-east and Transrail in the west), plus Railfreight Distribution for international and wagonload trains, Freightliner for container-carrying trains, and Rail Express Systems for parcels and mail trains. British Rail Infrastructure Services (BRIS) took responsibility for the engineering requirements of the railway. BRIS was subsequently organised for privatisation on the basis of seven infrastructure maintenance units (IMUs), which maintained the railway, and six track renewal units (TRUs), which replaced rail lines, both organised geographically.