How much $$$ is going to be spent changing this stuff?
That all depends on whether they are also consolidating and/or moving into a different location.
If all they are doing is changing the names of existing Divisions (to eliminate former N&W and SOU Division names) then all they need is some new signs, new business cards for salaried employees, and new Division Timetables. That is not much of an expense.
However, if they are moving into new quarters, that could make a difference, depending upon whether the railroad owns the new building, or, instead, has to lease or purchase a building. If employees have to physically relocate, then there would be relocation expense.
So . . . "It depends."