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.

 This is Micro trains Line SD40-2 Santa Fe model which I customized with working ditch lights.

Well here goes nothing. I bought a MTL F-7  trainset, a GP-35 trainset, also a Marklin 81466  Micado steam loco set.I also got 2 packs flex track [ ... ]

Micro-Trains Military Barracks Build by Modelersguild.com

Building this Z-Scale kit was a real pleasure. The parts fit nicely, the materials were right, [ ... ]