Wallace Line by the Sahul Shelf to New Guinea. The biogeographic boundary known as Lydekker's Line, which separates the eastern edge of Wallacea from the Australian region, has a similar origin to the Wallace line. During ice age glacial advances, when the , both Asia and Australia were united with what are now islands on their respective continental shelves as continuous land masses, but the deep water between those two large continental shelf areas was, for over 50 million years, a barrier that kept the flora and fauna of Australia separated from those of Asia. Wallacea consists of islands that were not
S-Line (Norfolk Southern) S-Line (Norfolk Southern) The Norfolk Southern S-Line is a secondary railroad line which runs between Morristown, Tennessee and Salisbury, North Carolina. It is operated by Norfolk Southern Railway under 2 divisions. Half of the line is within the Piedmont Division and the other half is in the Central Division. Trains on the S-Line are mainly manifests, locals to and from Asheville and Salisbury, North Carolina and coal trains to Catawba and Belmont, North Carolina. Local trains operate at several different yards between Salisbury and Asheville, North Carolina. Intermodal trains and Amtrak passenger trains do not use this line. All trains