USRA Heavy Pacific 4-6-2

Our 7 1⁄2-inch gauge live steam USRA 4-6-2 Heavy Pacific is offered as a completed ready-to-run locomotive chassis-on-air. 

Please note: We are not currently actively producing this model. Parts are available — please contact us if interested.

Richard Ronnie on his Pacific
Richard Ronnie on his Pacific
Goldmann Pacific and 2-8-0
Goldmann Pacific and 2-8-0

Benefits of Our Chassis-on-Air Offering

  • Ready-to-run chassis-on-air — Saves you time and mistakes, guarantees results
  • Precision CNC machined — Greater accuracy, better finishes, smoother running
  • Hardened and ground parts — Less wear, longer life expectancy
  • Powder coated — Long-term protection and durability
  • Fully assembled — Our experience saves you time and guesswork
  • Tested and adjusted — We make it run right before we deliver it
  • Ready for custom finishing by the hobbyist — Add your own finishing detail
USRA Heavy Pacific 4-6-2

"Those chassis are beautiful...You have the right idea...I love doing the finish work, but hate the tedious machining involved in building the chassis."
— T.S., Lufkin, Texas

USRA Heavy Pacific 4-6-2

Specifications

Chassis-on-Air Specifications

  • Drivers: 17 Spoke x 10" Diameter
  • Cylinder Bore: 2.750" Diameter
  • Cylinder Stroke: 3.500"
  • Piston Valves: 1.500" Diameter
  • Overall Length of Frame & Pilot Beam: 71"

Smoke Box and Boiler Specifications

  • Smoke Box: 10" Diameter
  • Boiler: Conical 10" Nominal Diameter (10 3⁄4" actual OD) x 45 Tubes

Quality Features

  • Castings: Top quality from top commercial foundries
  • Accuracy: Precision CNC machine work
  • 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 Block: One piece casting, fully cored including all intake & exhaust passages, very free breathing
  • Baker Valve Gear Frame: Silicon bronze casting
  • Baker Valve Gear Internals: Stainless steel lost wax investment castings
  • Spring Rigging: Fully equalized including pilot truck and trailing truck
  • Brake Rigging: Fully equalized
  • Paint: Powder coated
USRA Heavy Pacific 4-6-2
USRA Heavy Pacific 4-6-2 blow-down

What is a "Chassis-on-Air"?

This stage of locomotive completion is what we call a chassis-on-air. The fully machined, painted, plated, and assembled chassis-on-air can actually be "run" for testing or demonstration purposes by supplying compressed air to the cylinders.

Testing the completed chassis by running it on compressed air confirms that all of the machine work and assembly of the locomotive chassis has been performed correctly before you move on to the next phase of construction.

In addition to providing you with a chassis-on-air, we can also provide you with a completed and pressure tested boiler. We can then put you in contact with a number of qualified suppliers who specialize in a variety of additional items needed to complete your locomotive — including injectors, check valves, safety valves, water gauges, pressure gauges, pumps, hand rail components, completed tender tanks, and even ready-to-run tenders.

Our chassis-on-air approach gets your 4-6-2 building project going fast and helps get you on the track sooner. Our 4-6-2 Heavy Pacific is designed to put a high quality, CNC-machined chassis within the reach of hobbyists without requiring extensive machining experience or an elaborately equipped machine shop. This approach allows you to custom finish and detail the rest of the locomotive and tender according to the railroad you want to model and your own desires.

Interested in our USRA Heavy Pacific 4-6-2? Contact us — we'd love to hear from you.