After the railway network was privatised in the mid-1990s, it was decided that when the existing "Heritage" ticket issuing systems (APTIS, SPORTIS and the Quickfare passenger-operated machines) needed replacing, the contracts should be put out to competitive tender. Although the Rail Settlement Plan (RSP) scheme, overseen and controlled by the newly created Association of Train Operating Companies (ATOC), would set various requirements and regulate the introduction of such systems through an official accreditation process, any company which wished to set up a ticket issuing system and offer it for accreditation could do so. Once it had been accredited, the system could then be offered to the individual Train Operating Companies once they were ready to replace their existing equipment.