First try on a locomotive

[faraway]

What the heck, I gave it a try....





The white wash settled preferred in the grooves and around the black stack. The engine looked like bombed with flour. It got another black wash to run into the grooves (where the dirt houses and no faded paint) and the stack area got a new black layer.
After that the blue part is "acceptable" but not more. The yellow cab is the problem. The large planes are not weathered but look like painted with milk. That is what I was afraid of. It happened to some modern boxcars with large unstructured planes too.
The overall impression of the engine is much more run down than the others.

I think there is a problem in my concept. A wash tends to run into the grooves like dirt does. That is the effect we need for the black wash. To have faded out paint the light wash shall stay on top of the solid paint on the planes. What is my mistake?

Update:
A test on the engine from yesterday got better results. The white wash looks like milk if it is mixed like milk. A new setup with much less white color and three layers of highly deluded wash on the yellow cab gives much better results.