There are two points to be aware of, pertaining to the green freight schemes. On the Alco, EMD and GE roadswitchers, the entire end handrail assembly, both rails and stanchions, was painted yellow. The stanchions look green in photos because they are dirty, but they were yellow.
Also, if you look at the stripe on the short hood of any roadswitcher, it comes to a point, then wraps around the end, and curves down, until the point of the stripe touches the walkway. On the older locos, prior to and including the GP30s, both ends were treated like this. On all locos built after the GP30...SDP35, GP35, U30b, and GP40, the stripe at the rear of the long hood, went straight across the back. This applies to both green freight schemes. SAL painted a few older roadswitchers in the Jolly Green Giant scheme. I dont know how the end of the long hood was treated on these few locos. I've never seen a photo of one; I did see a model of an EMD that had the horizontal band on the rear. Hope this helps.