Walthers GE Dash 8-32BHW's

Empire Builder

Great Northern fanatic
I noticed that in one of Walther's train sets that they had an Amtrak
Dash 8-32BHW that was in the ''pepsi can'' paint scheme but w/ a black roof. Now I have to admit that that design looked cool; but I've never seen one with a black roof; they have always been grey instead of black. So is Walthers being inacurate here, or not?