Add prototypical operations to your layout with the WalthersProto Scale Test Car, decorated for Union Pacific as car #903148. Real railroads used these heavyweight cars to calibrate track scales, and they were regularly hauled between yards for reweighing — giving you a great excuse to run one at the rear of a train, spot it at an industry, or pair it with the Walthers Cornerstone Track Scale. The diecast body gives this HO scale car real heft, and it comes ready to run with metal wheels and knuckle couplers.
Features
- Diecast metal body for maximum weight, just like the prototype.
- Union Pacific–specific details including side and top access doors, power hand brake, and exposed wheel bearings.
- Factory-installed wire grab irons and multiple photo-etched brass placards matching the prototype.
- 33" scale RP-25 turned metal wheels for smooth, reliable tracking.
- Proto MAX metal knuckle couplers installed.
- Limited-run release from WalthersProto.
Specifications
| Brand |
WalthersProto |
| Item Number |
920-105306 |
| Road Name |
Union Pacific |
| Road Number |
903148 |
| Scale |
HO Scale (1:87) |
| Era |
Transition Era – Modern |
| Body |
Diecast metal |
| Couplers |
Proto MAX metal knuckle |
| Wheels |
33" RP-25 turned metal |
FAQ
Is this car ready to run out of the box?
Yes — it comes fully assembled with couplers and metal wheels installed. Just set it on the rails.
Why would a railroad own a scale test car?
Railroads billed customers by weight, so track scales had to be accurate. These cars were built to an exact known weight and used to calibrate scales across the system.
What era does it fit?
Scale test cars served for decades, so this car looks at home on layouts set anywhere from the transition era right up to the modern day.
Will it work with my existing couplers?
Yes — the installed Proto MAX metal knuckle couplers are compatible with Kadee and other standard HO knuckle couplers.
Explore More
Round out your freight consist with more rolling stock, browse our full HO scale collection, or see everything from WalthersProto at Squeaky's Trains & Things.
