Stanray M3 Underfloor Wheel Truing Machine

The Stanray® M3 is an underfloor railway wheel truing machine for restoring worn wheel profiles on heavy haul and commuter locomotives’ wheel sets. Utilizing proven Stanray full profile milling technology, the M3 performs fully automatic measuring and cutting cycles while managing extreme wheel wear conditions. The pit-mounted configuration means wheel sets are reprofiled while mounted in the locomotive, decreasing dwell time at the maintenance facility.

Wheel truing machine Stanray milling cutters

The Stanray M-Series Wheel Truing Machines include integrated automatic measuring systems that monitor the wheel location and measure diameter, width, and profile as well as wheel set back-to-back, back face runout, and radial runout on the tread. Final diameters, profile conformity, and other desired parameters are verified and sent to the customer’s data management system or stored locally. The connectivity of the machine also allows for optional remote diagnostics, which will keep your revenue vehicles safe and on track.

Machine Specifications

Download our Stanray M3 Underfloor Wheel Truing Machine product data sheet — for the full machine specification, please contact the Machine Sales team.


30-45 minutes per wheel set (depending on measurement options selected)

Profile Accuracy

+/- 0.008 in. | +/- 0.2 mm

Diameter Parity

+/- 0.006 in. | +/- 0.15 mm

Roundness (Radial T.I.R.)

+/- 0.004 in. | +/- 0.1 mm

Surface Finish (as Machined)

< 200 μ” Ra | < 5 μm Ra

Electrical Power

127 kW

Maximum Compressed Air

80-100 psi @ 15 SCFM

Maximum Axle Load

 40000 lbs. | 180 kN

Maximum Wheel Diameter (at Tapeline)

44 in. | 1118 mm

Minimum Wheel Diameter (at Tapeline)

17 in. | 432 mm

Maximum Wheel Width

5.85 in. | 148 mm

Minimum Bogie Clearance (Lowest Point Above Rail)

2 in. | 50 mm

We're here to help

The Simmons Customer Service Center (CSC) 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

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