High Level Output Specification
High Level Output Specification : The HLOS is the specification of the outputs required from the rail network by Scottish Ministers. It is produced as part of the process established by the Railways Act 2005 to review and set access charges. A parallel process operates in England and Wales. The Access Charges Review for the period 2009 to 2014 will commence in 2007 and the HLOS will be developed to support this