Mainlinemeans the Mainline Group Limited;
the 1971 Actmeans the Pensions (Increase) Act 1971;
the Executivemeans the South Yorkshire Passenger Transport Executive;
the Pensions Authoritymeans the South Yorkshire Pensions Authority;
the Pensions Authority Fundmeans the superannuation fund maintained by the South Yorkshire Pensions Authority;
the principal Regulationsmeans the Local Government Superannuation Regulations 1986;
the Transport Authoritymeans the South Yorkshire Passenger Transport Authority;
the Transport Companymeans South Yorkshire Transport Limited.