NS or N&W

Tue May 19 10:45:36 EDT 2020

If the NS Corporation became effective June 1, 1982, how come the Pocahontas Division track map dated January 1, 1984 was still labeled N&W and the Pokey was still using N&W symbols to identify their trains thru 1984.  Was there a transition period and when did it end?  Could one still refer to the Pokey as being N&W thru 1984?
Glenn Fisher
Cornwall PA 
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