BN BN original paint scheme

Being new here, I might ask something that has already been dealt with. But any help would be appreciated.

Basically, I have two different questions concerning the original BN paint scheme:

1: At the very beginning, the walkways of the diesels were green, I have a postcard showing a set of GP35s (if I remember correctly) which have bright green walkways. Just the way the original Athearn models had them. But BN must soon have changed this as there are hardly any pictures available in books or on the internet where green walkways can be spotted. It seems that BN first changed to something like a silvery light gray, and only some time later came up with the dark gray that one sees on most pictures.

Now my question, when were these changes made by BN, and are there any more photos that are accessible which also clearly depict the green walkways?

2: My second question concerns the white nose striping on the green BN diesels. There seems to have been some variation in the placement of the white stripes, but all the pictures of EMD units I have access to show 4 white lines running from the upper right to the lower left in a head-on view.

Now I own a Athearn model that has the stripes going from the upper left to the lower right. I presume that this is one example of the intentional negligence that Athearn employees cultivated for a while under their unloved old boss. But then, I wonder whether there might have been a few units that really did have their striping reversed. Again, any such pictures would be appreciated.