Stanray TN-84C Underfloor Wheel Truing Machine

The Stanray® Underfloor Wheel Truing Machine (TN-84C) is an underfloor pit-mounted milling machine, capable of simultaneously reprofiling both wheels of a railway wheel set using the axle centers as the machining reference point.

Stanray Underfloor Wheel Truing Machine in freight maintenance facility


The Stanray® TN-84C Underfloor Wheel Truing Machine is capable of profiling wheel sets to necessary specifications for tape size, concentricity and plane dimensions in any of the following situations:

While the wheel set is under a locomotive, passenger train or car, or other rolling stock
While the wheel sets are mounted in a truck
While the wheel set is demounted as a single set

Function and benefits of the Stanray

The Stanray will reprofile both wheels simultaneously to equal diameters, leaving a witness groove at the flange of the profile. The full profile milling technology does not require undercutting the tread surface or flat spots by 1.6 mm (1/16 inch) as required for single point turning method on the underfloor lathe.

Both wheels of a wheel set will be finished automatically to the diameter that is required to clean up, while removing the minimum amount of metal possible.

Substantial Material & Cost Savings
Increased Mileage
Minimal Metal Removal
Decreased Dwell Time

Machine Specifications

Download our Stanray TN-84C Underfloor Wheel Truing Machine product data sheet — for the full machine specification, please contact the Machine Sales team.


Cycle time study available upon request

Diameter Accuracy

+/- 0.020 in. | +/- .5 mm


+/- 0.020 in. | +/- .5 mm

Profile Accuracy

+/- 0.010 in. | +/- .25 mm

Surface Finish

 200 RMS axially, 150 RMS on wheel circumference

Milling Cutter Speed

30 RPM

Hydraulic Centering Ram Force

6600 lbs. | 2.9 kN

Hydraulic Hold-Down Force

15 tons | 133 kN

Electrical Power

76 kW

Hydraulic Reservoir

90 US gallons  |  340.69 liters

Maximum Wheel Diameter

58 in. | 1475 mm

Minimum Wheel Diameter

23 in. | 585 mm

Maximum Axle Load

50 tons | 445 kN

We're here to help

The NSH USA Customer Service Center is here to support you and your machine. As the original equipment manufacturer (OEM), we are ideally suited to keep your machine productive and operating safely.

We offer:

OEM Spare & Replacement Parts
New or Upgrade Services
Service & Inspections

Already have a Stanray?

Contact Simmons Customer Service Center today for support.

Interested in a Stanray Wheel Truing Machine?