GE AC4400CW

AC4400CW units with the distinguished 'AC trucks' are often referred to as the AH4400CW or CW44AH (by CSX) as a result of being "heavier" (built to similar specs as the ES44AH) or weighing more than the preceding units.
AC44ACCTE, AC4400CWCTE, AC45ACCTE (the "5" meaning the truck length)' AC44CCTE, AC44CWCTE, AC4400CCTE, C44AC-CTE or the C44CCTE are either alternate designations, units equipped with updated/upgraded electronics, or units retrofitted with features previously not included.
Other designations include: C44AC, CW44AC, AC44W, or AC44CW.
The "CCTE" ("C-C" and/or "Controlled Tractive Effort") suffix commonly refers to units owned by the UP which have updated/upgraded CTE software for its on-board microcomputer.