I also noticed that it says NS on the side. NS never had any AC4400CWs. CSX does though. CSX has them numbered #1-494, most if not all are in YN2 and do not have cab signals.
#495-599, and #5101-5122 are AC4400CW-CTEs which are identical to the AC4400CW externally, but have added weight to the frame to increase traction. They are all in YN3 paint and have cab signals.