Don't know what territory you are referring to - I am not NS knowledgeable. On CSX there are single track territories that are signaled with a automatic block signal system. The signals indicate 'track condition' but NOT the authority for movement. Authority for movement is conveyed by a Form EC-1 Track Warrant that specifies at start location and a end location and potentially instructions to take siding for a meet. There are a few areas of multiple track territories involved and for the most part those tracks are signaled for current of traffic operation.