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All Archive sources are placed in one of three Tiers.
Sources in Tier 1 are represented as fully as possible within the date ranges shown. They are:
ATOC (Association of Train Operating Companies) (2003-2016)
Department for Transport (2002-date) 
Department of the Environment, Transport and the Regions (1997-2001) 
Department of Transport (1995-1997) 
Department of Transport, Local Government and the Regions (2001-2002) 
London Regional Transport (1996-2003) 
Rail Delivery Group (2011-date)
Shadow Strategic Rail Authority (1999-2001)
Strategic Rail Authority (2001-2005)
= rail related documents only
Sources in Tier 2 are represented where their announcements are significant for the organisation or structure of the railway, or were published in connection with important events or developments. They are:
Network Rail (2003-date)
Office of the Rail Regulator (1996-2004)
Office of Rail and Road (2014-date)
Office of Rail Regulation (2004-2014)
OPRAF (Office of Passenger Rail Franchising) (1998-2000)
Railtrack (1997-2002)
Transport for London (2001-date)
Transport Scotland (2006-date)
All other sources are placed in Tier 3. Their announcements, statements, etc., are archived when they are significant in relation to the organisation or structure of the railway, or where they represent responses or other connections with documents from Tier 1 or Tier 2 sources.
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