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
By Bill Mock
December 2009

Here is the first stages of weathering of my new BN [ ... ]

Stonebridge Models Greenhouse Build by Modelersguild.com

It's funny - Sometimes in this gig, I come across a project that just amazes me. This Greenhouse [ ... ]

This is the first mainline run without any of the extras.