atsf gp 7 weathering please advice

Model Railroader Prototype information for the modeler
1

i all

i am trying to weather my atsf gp7 more or less like this one in the pichttp://www.railpictures.net/viewphoto.php?id=49145

i am only try to get a generally light white dusty appearence

i started with a bit more dust on the boogies a bit less on the sides and again a bit less on the front/end cabin and body

now i am a bit puzzled by the roof

do you think is there a lot of dust on the roof [from this pic]? or it looks clean enought to leave the model natural appearence since i used a very ligh dust so far to get its general appearence ?

thans for you guidance

2

http://www.railpictures.net/viewphoto.php?id=49145

i hope the pic will show now

3

i am no expert and i am guessing this dust is a fine white dust from the desert

4

do you think that in cases of very light dusty weathering this model could be prototopical ?

mhttp://www.brasstrains.com/Classic/Product/Detail/038296/HO-Oriental-ATSF-Santa-Fe-EMD-GP7-Diesel-2650-CUSTOM

5

SHOP BY DEPARTMENT- Brass (2236)

SHOP BY SCALE- 1 to 1 (0)

6

any advice at all ?