Trimble. Intelligence in Rail.


Wheel surface inspection

Trimble® TreadView® is an automatic non-contact optical wheel surface inspection system that images and inspects wheel tread surface, flange, and plate areas at mainline operational speeds.

Automated optical wheel surface inspection system

TreadView offers visual inspection of complete wheel tread and flange surface using optical imaging and laser scanning. The objective of the system is to determine any surface abnormalities of the wheel that can be detected using high resolution images of the wheel and high density 3D data of the wheel surface. A simplified version of the system is available to measure wheel out-of-roundness for high-speed passenger train operators.

State of the art technology for maximum accuracy

TreadView deploys a unique state of art digital imaging and laser scanning technology for maximum data density, accuracy, and efficiency. The product benefits from a series of sophisticated image processing algorithms to assess wheel tread and flange surface condition from acquired multispectral multi-illumination images.

Measurements at line speed, 24/7

A major highlight of the system is that it operates at mainline speeds up to 60 mph (100 km/h) for greater utilization by rail operators. Another important advantage is that it can also operate at very low speed, where traditional “contact” impact and force measurement-based systems fall short of detecting wheel surface problems such as flats due to restrictive speed limitations.

Dramatic time and cost savings, versus manual inspections

Automate and complete optical wheel surface inspections quicker, minimizing time taken, costs, and issues that disrupt service.

Rolling stock stays in service for longer

With accurate measurements at mainline operational speeds there is minimal disruption to rolling stock schedules.

Limits risk to personnel, works 24/7, even in tough environments

TreadView works in even the toughest environments and at night so field workers are not in unpleasant or unsafe working conditions thereby reducing the risk to their safety.

Digital accurate records, with automated alerts of issues

Providing digital records that are usable across operations and maintenance TreadView reduces manual and paper-based workflows saving time and money. Critical issues are flagged and reported automatically so that corrective actions can be taken with less impact on service.

Inspections & Measurements

Trimble TreadView system inspections and measurements include:

  • Shelled and spalled tread.
  • Major scrapes, dents, and gouges.
  • Broken/missing wheel sections.
  • Shattered rim.
  • Broken or damaged flange.
  • Wheel flats and slid flats.
  • Wheel OOR (out-of-round).
  • Built-up tread.
  • Tread groove.
  • Vertical split rim (flange or field side).
  • Significant spread rim.
  • Wheel tread hollow around the wheel.

Depending on the rolling stock types and requirements, the system’s inspection and measurement outputs may require optimization or customization.

Trimble TreadView system provides detailed imaging of the wheel including images of the tread surface and wheel plate.

System Features

  • Bi-directional system.
  • Inspection and measurement at mainline operational speeds.
  • Operates in extreme environments.
  • Installed off track (concrete or steel base) with no track interference.
  • Easy maintenance.
  • Automatic defect reporting.

Software Features

  • Digital image acquisition/processing.
  • AEI (RFID) integration.
  • Automated reporting.
  • Web-based interface and database for data visualization and analysis (with Trimble CMMS™ (Condition Monitoring Management System) or TrainWatch™ software).
  • Remote monitoring/control.


  • Freight & heavy haul
  • High speed
  • Passenger
  • Metro
  • Tram

Installation Location

  • Mainline
  • Depot
  • Yard
  • Indoors

Power Requirements

  • 110V AC or 220V AC
  • 11.5kW

Periodic Maintenance

  • Annual calibration.
  • Annual inspection & service.
  • Quarterly inspections.

Installation Position

  • Off track/concrete or steel base.

Remote Diagnosis

  • Yes

Automated Health Reporting

  • Yes

AEI/RFID Integration

  • Yes

Air Purge Unit

  • No
Specifications subject to change without notice.


  • Datasheets


    Trimble® TreadView® system is a sophisticated automatic non-contact optical wheel surface inspection product that inspects wheel tread surface, flange, and plate areas at mainline speeds.

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