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ATSF GP40X 3800
I upgraded the Athearn Ready-to-Roll model with added details, decals, and weathering
Above: I replaced Athearn's incandescent light bulbs with LEDs at the
same time I installed the DCC decoder. I added a drain line to the cab
front using brass wire, and A-Line window wipers all around. On the
nose, I sanded off the class lights and brush-painted with Tru-Color
brand Sulfur Yellow. On the anti-climber I added Details West MU
cables and receptacles. The pilot received Detail Associates coupler
lift bars and grabs on the snow plow.
Right: On the rear, I added Details West MU cables and
receptacles, as well as air hose retainer grabs. The lower
class lights were sanded off, BLMA upper blanks added,
and brush-painted Tru-Color Sulfur Yellow as was the
anticlimber. The couplers were brush-painted Roof Brown.
Below: GP40X 3800 leading a consist of Santa Fe high-horsepower 4-axle
locomotives. All photos were taken on my Glen Frazer Free-mo module set.
I applied home-made safety slogan decals to all four corner step wells.
Below: Both sides received Detail Associates cab air deflectors. On the right side I added Details West speed recorder and spare coupler
knuckles on both trucks per Santa Fe practice. The sanding hoses are made from gray-jacketed solid-core 30-gauge electrical wire, which
holds its shape once formed to the proper curve. I used powdered chalks for the road dust weathering, fixed in place with Testors Dullcote spray.
Below: On the left side I installed Details West air filter set behind the fuel tank.
I also added small styrene triangles to the walkway step ends, both sides. This detail appears to have been unique to the GP40X.
Also on both sides I applied Microscale decal flags to the battery boxes - these showed ATSF's support for the troops in the first Gulf War.
Below: From front to back, I removed Athearn's beacon and radio platform, filled the holes, and brush-painted Tru-Color brand
Sulfur Yellow, a close match to Athearn's paint color. I installed a Plano Models "blank" beacon platform and dry-brushed some
rusty spots simulating where Santa Fe had removed the beacon. Behind the air conditioner unit, I installed a Plano Models EOT
platform with Details West antenna on top. I scratch-built a styrene radio platform with Detail Associates antenna added. I installed
wire lift rings and Detail Associates plastic lift tabs on the roofline. Toward the rear next to the radiator fans, I installed Details West
EOT platforms and antennae to model the Locotrol antennae, a distinct spotting feature for Santa Fe GP40X 3800.
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Right: 3800 was the class unit of
Santa Fe's 10-unit GP40X fleet.
The GP40X was a prototype for the
GP50, and featured flared radiators.

My model is based on this 1989
photo, where the flag logos are
present, the EOT antenna has been
added, but the horn and headlight
have not yet been relocated.
Right: A better view of the unique
flared radiators. One Locotrol remote
control antenna is just visible on the
roof near the radiator fans. Also
visible here is the small sloped
flange at the walkway step end.
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