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The interurban (New South Wales TrainLink) network has no link between each successive run performed by a train. Train numbers are four characters, beginning with a one/two letter prefix, followed by numbers. Electic locomotives, as well as diesel trains use an AANN format, with the first letter being the region, the second being the type of train, the third is the general area of operation, and the fouth is a unique identifier. Electric Interurban trains as well as Hunter line services generally use an ANNN format, with the letter being either the region code, or an alternate code (which can be found in the TOC Manual and the WTT). A combination of a letter and a block of numbers also have different meanings (eg N100-N199 is for northern region Intercity V sets operating between Sydney, Hornsby or Gosford to Newcastle Interchange). Oscar and Tangara trains operating on interurban lines generally use the Metropolitan Format of a Run and Trip identifier.