Ken, the pictures you show of the railings do seem to resemble some used on the Aristo U25B, except for the end railings that appear to have right angle prongs at the base of the stanchions.
As to what color the railings are, it seems they are white (and or both) silver for the Aristo Amtrak U25B:
[img]https://thumbs.worthpoint.com/zoom/images4/1/1118/14/aristo-craft-trains-art-22136-atk_1_e522827c2a542a58275cadfd4490eb50.jpg[/img]
[img]https://thumbs.worthpoint.com/zoom/images2/1/0315/02/aristo-craft-art-22136-ge-u25-atk_1_f7991847ad560f3ec8ba922b8342215a.jpg[/img]
[img]https://thumbs.worthpoint.com/zoom/images3/1/0315/02/aristo-craft-art-22136-ge-u25-atk_1_f7991847ad560f3ec8ba922b8342215a.jpg[/img]
[img]https://thumbs.worthpoint.com/zoom/images4/1/0315/02/aristo-craft-art-22136-ge-u25-atk_1_f7991847ad560f3ec8ba922b8342215a.jpg[/img]
A prototype Amtrak GP40PH that has railings seems to have silver railings, too
[img]https://www.hebners.net/Amtrak/amtGP40/amt520.jpg[/img]
To see most Amtrak locos, clink on link below.
https://www.hebners.net/Amtrak/index.html
-Ted