An easy way to enhance the look of any diesel locomotive is to blacken the grills and vents to provide more depth.  You can use a black wash to bring out the grill or vent details.  Weathering powders are extremely effective bringing out locomotive vent and grill details.

Hopper Weathering Clinic II
By Bill Mock
December 2009

So here's how those BN Hoppers turned out after the surface rust dried. Not bad. I'll [ ... ]

So there I was..had my speeder all painted and glass in the window and everything dull coated and figure inside and..hunky-dory.
I went to LHS becasue [ ... ]

In other news, John M. is hospitalized, suffering from shock. ;-)