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The Union Pacific Challenger: Our Signature Locomotive
We offer you choices for building your own 7 1⁄4
- 7 1⁄2 inch gauge live steam model of the Union Pacific 4-6-6-4 Challenger:
- Rough castings
- Machined castings
- Machine drawings available with the purchase of our castings
- Partial construction available: machining and assembly of selected
sections
- Reproductions of original Union Pacific Challenger drawings
Benefits of our Union Pacific Challenger offering:
- Scaled down from original Union Pacific railroad drawings: Ensures high model accuracy
- Unique among models: Largest, most
powerful and only articulated model on the market
- Exceptionally high quality product: Fully
capable of producing a museum quality model
- Professionally made patterns and molds: Cleaner,
more accurate, beautiful castings
- Castings made by top commercial foundries: Top
quality, fewer casting problems
- Top quality casting materials: Higher
strength, better machinability, better finishes
- Precision CNC machine work available: Greater
accuracy, better finishes, smoother running
- Hardened and ground parts available: Less
wear, longer life expectancy
- Powder coating available: Long-term
protection and durability
- Partial construction available: Our
experience saves you time and guesswork
| Union Pacific Challenger built from our castings |
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| Challenger locomotive and tender built by our customer Bruno Platzer. Photo by David Lazarus. |
This model was built from our castings.
Just
imagine yourself owning a Challenger like this!
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| Proud builder and owner Bruno Platzer pulls the throttle on his completed Challenger. |
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Union Pacific 4-6-6-4 Challenger Specifications
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Drivers: Boxpoc, 8 5/8" Diameter
Cylinder Bore:
2.500" Diameter
Cylinder Stroke: 4.000"
Piston Valves: 1.500" Diameter
Fuel:
Builder's Choice, Typically Oil or Propane
Overall Length of Engine & Tender: Approximately 16'
Weight
of Engine & Tender: Approximately 2500 lbs.
Minimum Turning Radius: Approximately 60 feet
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Union Pacific 4-6-6-4 Challenger Smoke Box and Boiler Specifications
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Smoke Box: Conical, 11" Diameter at Front
Boiler:
12" Nominal Diameter (12 3/4" actual OD) x 68 Tubes
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Union Pacific 4-6-6-4 Challenger Quality Features
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Castings: Top Quality Castings from Top
Quality Commercial Foundries
Accuracy: Precision CNC Machine Work Available on Request
Axles:
Hardened and Ground
Axle Bearings: Needle Roller Bearings
Crank Pins: Hardened and
Ground
Side Rod Bearings: Needle Roller Bearings
Main Rod Bearings: Needle Roller
Bearings
Cylinder Blocks: Fully Cored Castings Including All Intake & Exhaust Passages, Very Free
Breathing
Valve Gear: Walshaert
Spring Rigging: Fully Equalized
Brake
Rigging: Fully Equalized
Paint: Powder Coating Available on Request
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Available only from us:
We are the exclusive source for
castings and drawings for building an accurate live steam scale model of the Union Pacific 3900 Series 4-6-6-4 Challenger
including the world famous Union Pacific 3985 Challenger steam locomotive and its impressive 14-wheel centipede tender. Union Pacific Challenger 3985 is one of 105 Challengers built for Union Pacific Railroad and is the world's largest
and most powerful operating steam locomotive.
| Full Size Union Pacific Challenger 3977 |
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| The real thing on display in North Platte, NE |
Best quality, exceptional accuracy:
Our Challenger is an
extremely well engineered and designed model steam engine. The entire design was done on a Computer Aided Design (CAD) system
extracting information from the original Union Pacific Railroad drawings for the 3900 class Challenger.
Our patterns
and molds have all been made by professional pattern and mold shops. All castings are produced by top quality commercial foundries.
The
castings are highly accurate to the prototype design and are of outstanding quality. The castings are fully capable of producing
museum quality models. We are frequently told by hobbyists that our Challenger castings are the nicest, most beautiful castings
available in the hobby.
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| Scale Model Union Pacific Challenger 3977 |
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| Built by our customer Bruno Platzer. Click to enlarge. |
Castings are available in either
rough or machined form. Castings may be purchased a few at a time, a section at a time, or all at once.
For customers
who order machined castings and/or parts, the machine work is done in our own Computer Numerical Control (CNC) machine shop.
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RR note cards! Note cards featuring our Union Pacific Challenger are available online from PRINTESSDI Note
Cards (photograph by David Lazarus).
Roger Goldmann * 413 Morrison Lane. * Santa Paula, CA * 93060 * USA
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