Laser Rail Inspection System (LRAIL™)

Pavemetrics® Laser Rail Inspection System (LRAIL™) delivers an entirely new and more cost effective means to inspect railway assets.

Most rail inspection sensors in the marketplace today are limited to a single function; they measure a specific parameter such as gauge, or perform a single task, such as imaging or tie grading.

The LRAIL delivers greater ROI by delivering a multi-functional inspection that delivers 2D imaging and 3D scanning in a single pass with fully automated analysis using Artificial Intelligence.

The LRAIL captures an impressive 1 mm X and Y, and 0.1 mm Z, resolution scan of the rails, ties and ballast area at speeds up 60 km/h at 1mm intervals (suitable for high-rail mounting), 120 km/h at 2mm intervals, and 180 km/h at 3mm intervals (suitable for dedicated test cars and autonomous box cars).

The LRAIL’s Artificial Intelligence algorithms automatically measure and detect changes related to gauge, cross level, alignment, spikes, clips, tie plates, joint gap, joint bar bolting, rail surface wear and tie grade.

Artificial Intelligence-based Inspection and Change Detection

The LRAIL’s advanced Deep Neural Network automatically detects railway components, assesses their condition and detects changes between repeat runs.

Sensor Technology That is Proven in More than 45 Countries

The LRAIL leverages Pavemetrics prolific LCMS® technology; with more than 200 units in use in more than 45 countries, the LCMS is hands-down the most widely adopted and trusted sensor of its kind.

FRA Field-proven Results

The inspection process is fully computer-driven and objective, with results being just as accurate, and much more repeatable, than manual inspections. The LRAIL’s performance has also been field-tested and verified by the United States Federal Railroad Administration (FRA).

Simultaneous Geometry Measurement, 2D Imaging and 3D Scanning

By capturing both 2D images and 3D profiles all in the same pass, and including Artificial Intelligence-based data processing, the LRAIL can easily replace multiple legacy measurement systems. Saving you cost, weight and power.

See it in Action

Click on the movie below to see high resolution 3D scans from the LRAIL.

Key Features

  • Inspection at speeds up to 180 km/h
  • Supports narrow, standard and wide gauge measurements
  • Simultaneous 3D point cloud and and 2D high-resolution Imaging
  • Daytime and night-time operation, immunity to shadows
  • Fully automated Artificial Intelligence-based railway inspection:
    • Change detection
    • Wooden tie grading (location, skew angle, crack length, crack depth, crack width, tie grade)
    • Concrete tie grading (location, skew angle, crack length, crack depth, crack width, tie grade)
    • Clip inspection (location, type, loose, missing, damaged, covered)
    • Crossing inspection (location, crossing point detection, wear profiles)
    • Switch inspection (location, toe detection, toe damage, foot detection)
    • Rail open surface damage (chips, cracks)
    • Joint detection and gap measurement
    • Joint bar bolt counting
    • Gauge width, cross-level between rails, alignment
    • Railhead top and side wear (also grooved rail wear)
  • Data are automatically location-referenced using mile-point and inertially corrected GPS (x, y and z)
  • Compact; sensors weigh only 13 kg each and can be mounted on a high-rail vehicle or a dedicated inspection car
  • Rugged components mounted in environmentally-sealed enclosures
  • Low-power consumption
  • Data compression algorithms to minimize storage requirements


  • 28,000 Hz scanning frequency
  • 60 km/h at 1mm intervals, 120 km/h at 2mm intervals and 180 km/h at 3mm intervals
  • 1 mm transverse resolution
  • 0.1 mm vertical resolution
  • 0.25 mm vertical accuracy

Laser Triangulation for Track Change and Defect Detection
Authors: Federal Railroad Administration
Abstract:This report documents the successful demonstration of automated change detection on railroad track. Pavemetrics Systems Inc. performed this research under contract with the Federal Railroad Administration between March and December 2017. The project successfully demonstrated the ability of its Laser Rail Inspection System (LRAIL) to detect changes in fasteners, anchors,spikes, ties, joints, and ballast—as well as record rail stamping information on Amtrak’s Harrisburg line.

Extended Field Trials of LRAIL for Automated Track Change Detection
Authors: Federal Railroad Administration
Abstract:This report details the deployment of Pavemetrics’ Laser Rail Inspection System, “LRAIL,” for the purposes of automated change detection. The project was conducted between September 2018 and December 2019 at filed locations on Amtrak property and at Pavemetrics’ offices in Quebec, Canada.The project involved a combination of field sensor data acquisition, deliberate manual changes in the field, office algorithm development, algorithm testing and validation, and system performance reporting. The extended field trial proved successful. Repeatability, mean, and standard deviation of change measurements were determined and noise floors for each measured parameter were established.