EL 632 Far left: Here, you can see the effects of the wash on the side of this F7. Note the black streaking that simulates the effects of dirt being washed down the side of a unit by rain.
Grime or Earth, aiming the air- brush from the top down to sim- ulate general dirt that settles on the top surfaces of the trucks. Then use a darker brown shade, such as Rail Brown, from below track level, aiming the airbrush upward on the truck face to sim- ulate the road dirt and mud that splashes up from the roadbed and track. Again, you are using highly diluted paint, so you build up the effect slowly. It is bet- ter to have to go back and add weathering because it is difficult to “undo” a too-heavy weathering job after you are finished. Later, we will come back to the trucks and fuel tanks for other effects, such as fuel spills, using a regu- lar paintbrush. Remember, you are not “painting,” you are add- ing a thin coating of highly dilut- ed paint to simulate the effect of
dirt and grime on the locomotive. The major weathering effect on pilots is the streaking that occurs from dirt and water kicked up from the unit ahead when it is in a multiple-unit consist. Spray ver- tical streaks in line with the track gauge. Earth, Rail Brown, and/or Mud works well here. Don’t get carried away — spray just enough to show an effect. While you have those colors in the airbrush, you can spray the end faces of the fuel tanks since they also get spattered from the wheels kicking up dust and dirt. Finally, paint the couplers with a mixture of Rail Brown and Rust in about nine parts of Rail Brown to one part of Rust. Use light ap- plications (again a one-to-one mixture of paint to thinner) on the couplers, so you don’t impact the operation of the couplers.
The Car body or Shell – Using Washes to Simulate Rain and Snow Effects
The next step is the use of highly diluted washes to simulate the effects of rain and snow on the sides of the diesel locomotive car body. Studying photos of the pro- totype gives you a good guide to use to simulate that effect you are trying to create on your model. Washes are nothing more than paint highly diluted with thinner. A good starting point is using one part Floquil Engine Black to nine parts Testors Universal Air- brush thinner. With acrylic paints, such as Polly-S, use denatured al- cohol to dilute the paint. Using plain water will cause the wash to bead up on the surface. Apply the wash with a soft, flat brush about ¼-inch wide. The idea is to build
GP7 951 Left: Using a black wash on a black locomotive isn’t effective. Instead, use a medium gray wash to show the streaking effects of dirt. Go lightly with the gray — it will dry more pronounced than it appears wet.
F-M 854 Below left: Before any weathering with an airbrush, be sure to mask the windows and headlight lenses either using masking tape or Microscale Micro-Mask.
SP 6190 Below: Typical weath- ering pattern on a flat carbody, such as an F-unit, is the bow wave effect. Using your air- brush, sweep over the side from below and just behind the pilot to midway along the side with thinned dirt or mud color.
FEBRUARY 2016 63
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