Glossary of Terms A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 0 1 2 3 4 5 6 7 8 9 Disciplines Categories Change Request Alternative This term has wide common usage and may be used within the rail industry/is associated with a preferred Legacy This is the term historically used and is recorded to allow readers to interpret legacy documents. It should not be used in new documents. Non-preferred Obsolete This term refers to items no longer in use. It should not be used in new documents Other An item not covered by other categories Overseas It should not be used in new documents. Preferred This is the term to be used for all RISSB Standards Products Regional This term is in common usage within a state, locality or by a rail organisation. It can be used in providing context but must be associated with a preferred term.