Category: Painting and Weathering

Step-by-step guide on repainting a locomotive. GP40-2 from CSX to Southern Pacific.

Repainting a locomotive can be a fun and rewarding project. I got a couple of N scale Atlas GP40-2 locomotives painted and lettered for CSX off eBay. They were reasonably priced, and I wanted to repaint and letter them in Southern Pacific Railroad’s “Bloody Nose” paint scheme, so I bought both to use them on my N scale layout.

Before proceeding with the repaint, I wanted to make sure I could replace the factory-installed Rapido couplers with Micro-Trains. It turned out to be an easy upgrade.

Disassembling

Before repainting a locomotive, it’s best to remove the old paint completely. I began by detaching the shell from the chassis and disassembling all its parts before soaking them in 99% isopropyl alcohol.

I carefully removed all clear plastic components, such as the headlights and windows. Additionally, I disassembled the trucks, as I plan to repaint them SP Gray.

Now, all the parts are fully disassembled and ready for paint stripping.

Paint stripping

I submerged all the disassembled parts in 99% isopropyl alcohol, using a glass jar with a sealing lid to prevent evaporation

After 24 hours, I used a soft toothbrush to carefully remove all the softened paint. I paid particular attention to the delicate handrails to avoid damaging them while ensuring the paint was completely removed.

Repainting the locomotive parts

I then painted the nose and tail with SP Scarlet with an unopened bottle of Polly Scale paint that has lasted through the years – I purchased it in 2006! A a backup bottle of Vallejo Red RLM23 (71.003) was available, which can be used as a substitute for the discontinued Polly Scale color.

I prefer SP Scarlet from Polly Scale over Vallejo Red, as it should match the red “wings” on the Microscale decals.

After masking the nose and tail, I painted the rest of the locomotive in SP Lark Dark Gray. I had a couple of Polly Scale SP Lark Dark Gray bottles from mid 2000s, but neither aged well. So I opted for Vallejo Engine Gray (71.048), which is a very close match.

I also painted the disassembled trucks and fuel tanks. After letting everything dry, I removed the Tamiya 6mm masking tape.

And here are the two GP40-2 locomotives, ready for a coat of clear gloss varnish before applying the lettering.

Detailing

Before finalizing the painting, I added a few details to the locomotives: cab sunshades and snow plows. I purchased them from Trainworx.

I used a hand drill with micro drill bits to carefully make holes in the cab for the sunshades.

Then I installed the sunshades, securing them with a tiny drop of Tamiya Multipurpose Cement (Clear) glue.

After the glue has dried, I painted the sunshades with the same Vallejo Engine Gray color.

I then added a Trainworx snow plow. Using a sharp hobby knife, I trimmed a small piece of plastic from the locomotive’s front to fit the plow.

Then, using a hand drill and a fine drill bit, I drilled two small holes.

I used Tamiya Multipurpose Cement (Clear) glue to secure the snow plow in place.

Lettering

Using Microscale decals, I completed the GP40-2 lettering after repainting the locomotives. I chose to model units 7240 and 7609.

The red wings on the nose are always a bit tricky to apply, but I managed to get through it.

Weathering

I then applied a weathering coat by washing the grills and adjacent areas with black India ink, followed by airbrushing a couple of layers of Polly Scale Depot Buff (70/30 thinner-to-paint mix).

The Depot Buff (light tan color) replicates a layer of accumulated dust.

Here is the final result. Southern Pacific GP40-2 7609 and Southern Pacific GP40-2 7240, both equipped with a Zimo MX615 DCC decoder.

Step-by-step on painting freight cars in batches with airbrush and acrylic colors

Painting freight cars: I recently purchased a few inexpensive, older Roundhouse boxcars and Athearn mechanical reefers on eBay to repaint and letter for the Southern Pacific Railroad and Southern Pacific Fruit Express.

For this project, I used the discontinued Polly Scale Boxcar Red – yes, I still have a bottle from 2007 – along with Vallejo acrylic paints. Unfortunately, the Polly Scale paint had aged poorly and clogged the airbrush, regardless of how much I thinned it.

Boxcar Red color with Vallejo acrylic paint

To achieve a convincing “Boxcar Red” color, I mixed equal parts of Vallejo Camouflage Medium Brown (71.038) and Vallejo Brown RLM26 (71.105).

Painting freight cars in batches

I prefer to paint in batches to make the most of my effort.

This time, I prepared three 2-bay covered hoppers, four boxcars, three 57′ mechanical reefers (to be painted and lettered for SPFE – Southern Pacific Fruit Express), and one old, inexpensive caboose.

57′ Mechanical Reefers

Soaking the boxcar shell in 99% isopropyl alcohol for at least three days significantly simplifies the paint removal process. As shown above, the paint practically lifts off the shell!

I washed the car with warm water and a drop of soap to remove fingerprints or oils, wearing plastic gloves. I used a soft toothbrush.

Once completely dry, I sprayed a coat of Vallejo acrylic White Primer using an airbrush. I used a few drops of the Vallejo Flow Improver.

After painting the roof white (Vallejo White 71.001), I masked it off and sprayed the reefer with Vallejo Orange (71.083).

Then I carefully and slowly removed the masking tape

Here is future SPFE 459273.

Two other 57′ SPFE Reefers will be painted with black ends. I properly masked the car and sprayed some Tamiya XF-1 black thinned 3:2 with Vallejo Airbrush Thinner.

This time I experimented with a few drops of Vallejo Airbrush Flow Improver.

Reefers are now ready for a coat of gloss varnish. This layer provides a smooth surface for easier decal application, helping the waterslide decals adhere properly without silvering.

Lettering (applying waterslide decals)

To apply the decals, I first cut them out carefully, staying close to the printed edges for a clean finish.

I soaked the decals in warm water for 10–15 seconds, just enough to loosen them from the backing paper without over-soaking. I gently slid the decal onto the car, positioning it with a soft brush or tweezers.

For tricky areas, I used Microscale Micro Set decal-setting solution to help the decal conform to surface details like rivets or panel lines. For the most difficult irregular surfaces I used Microscale Micro Sol, to soften the decals for a few seconds before applying them.

Once positioned, I lightly dabbed with a cotton swab or soft cloth to remove excess water and ensure the decal sits flush.

I allowed the decals to dry completely before applying a final coat of clear matte to seal and protect them.

After the flat clear coat dried, I proceeded with installing Micro Trains Line 1015 body-mount couplers. I drilled a hole in the metal chassis e screwed the couplers down.

Painting undecorated cars can be a daunting task, requiring skills like airbrushing and decaling. However, finding a cheap undecorated car to experiment with and refine these techniques is fairly easy.

Moreover, if you have a decorated car that you never liked, it could be a good candidate for this project.

Painting an SP caboose, originally in Chessie System color scheme.

Step-by-step on painting an SP caboose. In the late 2000s, I was gifted an inexpensive (and rather imprecise) Chessie System caboose manufactured by Model Power. I wasn’t sure what to do with it until I found reference photos online. I discovered that some older cabooses were repainted with orange ends after 1955.

By the 1970s, it wasn’t uncommon to see these cabooses with their roofwalks and ladders removed. This inspired me to modify and repaint the caboose in Southern Pacific’s brown and Daylight Orange scheme, to use it on my N scale layout.

I know this model isn’t a perfect replica of the C-40-1 class caboose I’m aiming for, but I’m willing to accept the compromise. This project is a great opportunity to learn new techniques and, most importantly, have fun.

Filling holes

To fill the holes left in the roof after removing the roofwalks, I used Tamiya Putty.

Using a hobby knife, I removed the ladders from the end platforms, leaving only the brake wheel and a low handrail. I also removed the Rapido coupler from the truck to install a Micro-Trains 1015 body-mount knuckle coupler.

Painting an SP caboose

After filling the holes with putty and smoothly sanding them down, I painted the caboose. For the brown, I mixed two Vallejo Model Air colors, adding a few extra drops of Vallejo Brown RLM26 (71.105) to Vallejo Camouflage Medium Brown (71.038) instead of using a 1:1 ratio.

I then masked the shell for the Daylight Orange coat. I used Tamiya 6mm masking tape along with a wider masking tape purchased from a DIY store.

To paint the ends Daylight Orange, I used a very old bottle of (now discontinued) Polly Scale SP Daylight Orange that I’ve had since the mid-2000s. I carefully stirred the paint for a few minutes and thinned it at a 2:3 ratio (two parts paint and three parts thinner). Since the paint had aged poorly, I applied it in thin layers to achieve a smooth finish.

The shell is painted, and now I’m ready to paint the chassis. The stairs and the end platform will be painted brown.

After the paint have dried, I applied a coat of gloss varnish.

Lettering (applying waterslide decals)

To apply the decals, I first cut them out carefully, staying close to the printed edges for a clean finish.

I soaked the decals in warm water for 10-15 seconds, just enough to loosen them from the backing paper without over-soaking. I gently slide the decal onto the car, positioning it with a soft brush or tweezers.

For tricky areas, I used Microscale Micro Set decal-setting solution to help the decal conform to surface details like rivets or panel lines. For the most difficult irregular surfaces I used Microscale Micro Sol, to soften the decals for a few seconds before applying it.

Once positioned, I lightly dabbed with a cotton swab or soft cloth to remove excess water and ensure the decal sits flush.

I allowed the decals to dry completely before applying a final coat of clear matte to seal and protect them.

I painted the handrails white with a small paintbrush, using Vallejo white paint.

Trucks and Couplers

Trucks needed to be upgraded, so I used Micro-Trains 1184 (Bettendorf Switch Motion Caboose Trucks). I also installed Micro-Trains 1015 body-mount couplers.

Weathering

I started by applying AK Paneliner (Black) brushing it onto every panel line. Before proceeding, I removed the wheel axles and the couplers.

I then masked the sides of the trucks where the axle points sit.

Then, I applied a thinned layer of tan paint (20% paint, 80% thinner). I had an old Acqueous Hobby Color that was still in great condition, so I used it. I applied several thin layers to the lower part of the body and trucks to simulate dust accumulation from operation.

I brushed the trucks with some brown powder, which has a very flat finish and effectively simulates layers of rust and grime.

I added streaks of dirt running down from the roof exhaust.

I then applied a coat of Tamiya XF-86 Flat Clear to seal the weathering on the caboose.

Conclusion

While this model isn’t a perfect replica of the C-40-1 class caboose, I think it’s a great addition to the roster. Plus, it’s been a fun and quick project that I completed over the course of a few evenings.

Weathering flatcars to make plastic look like wood

Using acrylic paints, India ink, and a set of paintbrushes, you can achieve convincing results when weathering flatcars. I weathered the Atlas BN flatcar pictured below as well as an old Con-Cor SP flatcar, in service on my N scale layout.

I first removed the trucks with couplers, then proceeded using Vallejo acrylic colors.

The key is to work in light layers. For the Southern Pacific flatcar, which already had a brown base, I applied a wash of dark brown for added depth.

I used Vallejo colors: White (71.001), Uk BSC 64 Portland Stone (71.288), Beige (71.074), N. 41 Dark Olive Drab (71.316) and Dark Rust Wash (76.507). Additionally, I prepared a solution by mixing a couple of drops of Winsor & Newton India Ink with water and 10 drops of isopropyl alcohol. I painted each groups of 2-3 wooden planks in different shades to create natural variation.

Here is the Con-Cor SP flatcar receiving a wash of diluted black India ink.

I used Vallejo Retarder Medium (70.597) to extend the drying time of acrylics, making brushwork easier and more controlled. First, I applied a wash of White (71.001).

While Retarder Medium helps with layering by slowing down drying time, it also extends the overall drying process. I made sure the paint was completely dry before applying a wash of India ink, allowing it to seep into the gaps between the wooden planks by capillary action.

Then I carefully applied Vallejo Wash for rust effects, focusing on the area around rivets.

I applied another diluted, random layer of Mahogany (71.036) and N. 41 Dark Olive Drab (71.316) to tone down the red rust color.

Here is the BN flatcar after the paint has dried.

And here is the final result on the SP Con-Cor car. The goal was to create the look of old wooden planks weathered by the elements and stained by various load spills over time.