The NYC F3 were numbered 1606-1635. They were painted BLACK (DuPont 254-2234) with a LIGHT GREY band (DuPont 254-35453). The "whiskers" and edge bands were WHITE. The F3's were delivered with a partial stripe on the "A" unit as shown in boilermaker1's image, (The 1640 is an F7 however, not an F3.) The NYC F3 had "chickenwire" between the portal windows and also at the top side of the loco where the FARR or GE grills appear on the F7.
The NYC F3 "B" unit was not striped when they were delivered. However, based on all available photos, all NYC FREIGHT F units, both "A" and "B" units were striped at some point in their lives, probably when shopped.
The "A" units when new were also equipped with a different pilot, sometimes referred to as a passenger pilot. That pilot had the coupler covered by doors. Sometime during their lives, this pilot was also replaced with the "standard" F unit pilot.
As info, the NYC did have FOUR Grey F3 "A" units and TWO GREY "B" units that were classed by the RR as "Combination" locomotives. They were numbered 3500-03 ("A" units) and 3600-01 ("B" units). They were built in July, 1947 and our understanding is that they were purchased specifically for passenger service on the B&A. Three of the "A" units (3500, 3501, and 3503) were converted for freight service in Dec 1958-Jan, 1959, along with both "B" units. At this time the "A" units were renumbered 1874-1877, and the "B" units were renumbered 2475-76. After they were converted, they were painted black. These units as built did not have dynamic brakes. Overhead boiler water tanks were installed instead of brake grids and blowers.
There is a common misunderstanding that "some" NYC freight units were painted grey. They were not. One reason for this misunderstanding may be that the black lacquer faded to a grey after a short time in service.
Finally, I am the author of the NYCSHS website article on paint match. the article was intended to permit a modeler to EXACTLY match wet paint samples in the collection of NYCSHS. The article was not intended to define paint schemes for the many varieties of NYC diesels.
So did you even read it?