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September 2001 - Page 43


frame and journals in the HTCR-II offset positions. The brake cylinders were drilled with a #79 drill for air lines and mounted on the sideframes. The lines were bent from .012 wire. Note that the air lines are bent in a 3dimensional shape. The journal safety chains were cut and bent from a set of Athabasca etched chains and installed. Finally, .015 wire was bent for sanding nozzle brackets, with a small hook on the bottom, as previously described. The wire was installed by first installing the factory provided sand ing brackets. The fragile plastic arms were cut off and a #77 hole drilled through the remaining bracket base and the sideframe. The wire arms were inserted in the holes and retained with CA. When the shell is installed on the chassis, the sanding lines are bent up into the hooks, where the spring pressure of the sanding lines keeps them.

from a Microscale SD90MAC set. I spoke to Microscale on the phone about the problems, and they assured me they would look into it. I recommend you carefully inspect your decals with a magnifying glass prior to purchasing them to make sure the offset is not present. When the decals had set, the grabiron on the nose was installed and painted yellow. The factory handrails were sandblasted t o aid paint adhesion, painted gray, and installed. The ends were brush painted white along with the step edges. The entire model was then clear-coated with a 90:10 mixture of Glosscote and Dullcote. This gave the model a fairly shiny look, indicative of its newness. Light weathering was done, consisting of only a light misting of dust on the trucks and fuel tank and a bit of black around the exhaust stack.

When the weathering was complete, I installed factory window glazing. The factory provided light bulbs were installed in the housings, and a North Coast Engineering DA-SR DCC decoder was wired up in place of the lighting board. NCE provides suggested resistor values to use for the Genesis locomotives, and I found them to be perfect. The windshield wipers were painted aluminum and installed in the previously drilled h oles. MU hoses were fitted in the pilot holes. The ends were painted aluminum. The model was assembled and Kadee #58 scale couplers were installed in the factory mounts. This completed my model of UP 4637. With only five prototypes built, this model will surely not become a common factory offering in plastic (maybe Ill be wrong!!), but it makes a fun and unique kitbash for the prototype diesel modeler.

Final Assembly and Painting
The shell was primed with a light gray primer in preparation for the yellow. I used Polly Scale paints due to the accuracy of the colors when compared to the Union Pacific color-control standard cards I have in my collection. The yellow was sprayed first and masked. The gray was then sprayed. While the shell was drying overnight, I sprayed the interior a light tan and painted the seats brown and dash panels black. After the gray was dry, the shell was masked, leaving the grilles exposed. These were painted a dark gray with a small amount of brown added. Although the grilles are all painted the body color on the prototype, it does not take long on the road to dirty them up to where they look nearly black. The clean air intake on the left rear was drybrushed with yellow to highlight the grille, while the other grilles were drybrushed with Harbor Mist Gray. The anti-slip paint on the nose was modeled by adding a small amount of white to the gray paint. The dynamic-brake blower motor was brush painted light gray. T he roof was masked, leaving the dynamic-brake grille exposed, with the center button masked. Rail Brown was sprayed on the grille and allowed to dry. I removed the center mask over the button, and with the outside mask still in place, I drybrushed the grille with bright silver paint, highlighting the grille and resistor grids. Compare the resulting grille with the painted and drybrushed factory grille. The antenna dome and blade were painted white, and the can antenna painted black. The fuel fillers and gauges were painted red. Window gaskets w ere painted black and the side window frames and toilet drain painted silver. The decals were then applied. I had a difficult time with three different sets of Microscale decals for the SD70M. All three were brittle, and the white base was off set from the red and black on the lettering and striping, leaving a white outline under e very letter and stripe. I ended up using only the Z stripe, choosing to use lettering Manufacturer A-line

Bill of Materials
Part No. 29200 29210 29261 29460 101 103 1003 1004 1407 1553 1803 1807 2052 2156 2155 1507 1508 1803 1902 2206 2212 2310 3001 6206 101101 102213 196 224 226 236 244 245 276 277 300 302 303 87-110-5 87-527 87-997 87-1103 H1 111 4839 3015 Description Windshield wipers Sunshades Diesel steps, Athearn SD70/75 AEI tags Eyebolts & lifting lugs Chains and safety chains 22" x 65" EMD doors (3,0,0) 22" x 65" EMD doors (3,2,0) EMD radiator screens Super cab sunshades Dynamic-brake intake grille Dynamic-brake hatch EMD step lights EMD fuel tank detail set EMD standard air reservoirs MU receptacles MU Hoses Sinclair radio antenna Air vent, flat Eyebolt, wire formed Coupler lift bar AAR Type 1 Cab deflector Prime UP Type Sandfiller cover Freight car air hoses Lift rings Coupler lift bar bracket Spare knuckle and bracket Traction motor cable set Salem air filters MU cable Axle bearing caps Brake vent regulator valve Radio antenna, Can type Radio antenna, Wide Cone type Auxiliary detail set for SD70s Air hose, locomotive, drop type Snowplow Union Pacific Stripes GE & EMD Loco Data and Builders Plates Union Pacific SD90MAC Diesels Union Pacific SD70M Diesels Three-chime horn Grabiron ends Pipe union/elbow cluster 18" drop-type grabirons

Athabasca Cannon & Company

Detail Associates

Details West

Microscale

Miniatures by Eric PBL Precision Scale Tichy Train Group

SEPTEMBER 2001

MODEL RAILROADING 43

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