Stockholm Public Transport Administration Asset Management System

Mapping the entire Stockholm railway system.


  • Stockholm, Sweden


  • Stockholm Public Transport Authority

Project Value

  • N/A

Project Status

  • Completed in 2018

Innovative Solutions to Manage Railway Assets More Efficiently

Every day the Stockholm railway system handles 1,350,000 passengers. The railway network includes seven metro lines and nine light rail lines forming a 228 km long rail network. The network stretches through 47 underground stations and 169 other stations. Daily maintenance and planned upgrades on the complex railway network have increased and highlighted the need for an asset management system that provides necessary controls and monitoring. 

Now, the Stockholm Public Transport Administration, and their contractors, can use a single source to find relevant railway information throughout the network. This has been made possible by a WSP-developed data capture system, together with a rail asset management system backed by IBM Maximo, which merges visualization of the railway network with all railway-related objects into a 360-degree imagery and map viewer.

The image and cartographic application offers an intuitive and user-friendly environment through smart functions, adapted to common work-related tasks, such as viewing, measuring and adding new objects directly in the system.

After the Stockholm Public Transport Administration decision to implement a new railway asset management system, using Maximo solution produced by IBM, WSP saw an opportunity to develop a visualization technique for complex railway environments. As a result, an innovative rail management system was created, where all railway assets were provided with their geographical position together with cartographic visualizations and 360-degree imagery. Existing technologies were merged with innovative solutions to offer a railway asset product that gathers all the necessary information to meet the client’s needs and beyond.

Network length
228 km 228 km
Overground stations
169 169
Underground stations
47 47

Assets on the Railview map in Maximo

Leveraging Technology

WSP’s project team, consisting of specialists in geomatics, system development, and railways, have together developed a method and process for accurate and collection of assets in and around the whole track environment which was fed into an asset database where every object is classified, documented and georeferenced. An essential part of the method involves a data capture and mapping technique using both laser point cloud and 360-degree images. 

To facilitate functional planning for this project, the railway was surveyed using mobile mapping techniques developed by WSP. The system used for this project has evolved from Mobile Mapping Geotracker™, a road based mapping system that has been in operation for over a decade. This unique method of quickly gathering information along railways is called ‘on-track-scanning’ and uses a specially adapted and outfitted “on-track vehicle”.

The rail vehicle is additionally fitted with industrial Gocator-scanners for tracks. The Gocator scanners are high speed and able to scan in extremely high detail. This arrangement enables WSP to detect defects down to millimeter accuracy; effectively covering everyday maintenance issues and limiting traditional inspections to defects testing only.  The additional scanner setup enables track gauge measurements and track height differences. 

Data Visualization and Management

All the information required to populate the asset management database is extracted from the captured point clouds and images. There are two great advantages and benefits to this method: the laser point cloud enables a precise measurement of position, and the easy to use 360-degree image viewer helps quickly recognize and identify the objects.

The 360-degree images and laser data can even be published for specific user groups or stakeholders. Then users via Railview (Maximo and an integrated Orbit 3D-viewer) are able to navigate virtually the whole railway network and see information visually as they go. The system is especially useful, and possibly essential, for many projects that involve maintenance, refurbishment or completely new construction of facilities. It allows users to obtain information about any part of the railway infrastructure directly through their web browser.
As part of the project, we developed the cartographic application Railview. Railview is an interactive exploration and asset querying tool for a wider user group in the Stockholm public transport administration. It allows searching for and through asset information, visualizing it via a map, 360-degree images or a data table. Simplified filtering options are included to ease content and data exploration, for example by railway line, discipline/technical area, geographic position/zone or even free text.  

Clearance Profile and Clash-Detection Assessment

The GeoTracker system used to collect spatial data in this project includes sensors designed to provide information required for additional types of analysis. For example, it is possible to evaluate the cross-sectional clearance profile at regular intervals along the track and identify objects that are too close to the track and could be dangerous to passing trains. The method is based on laser scanned railway profile measurements used in conjunction with an ocular inspection of 360 degree imagery.

The analysis is undertaken in 1m intervals. All laser scan points in the preceding meter are included in the analysis. Every cross-section includes information in accordance with the client’s infrastructure model including, but not limited to, line, section, track number and mileage. All points within the clearance profile are detected and marked in red and used to support the planning future track side maintenance operations and removal of objects within the clearance profile. Beyond the mileage and location-specific information, the output also quantifies the number of clash points and highlights them visually.

Every potentially dangerous zone or object can be viewed in the 360-degree images via Orbit and even measured in the viewer via the measurement tool. This technology and methodology are the fastest means of analyzing entire rail environment and assessing the surrounding environment.

Contact Wire Position Statistics

Contact wire positioning is achieved through high accuracy line and LiDAR scanners. These are used to detect and establish a rail top surface (providing the track centreline) and LiDAR scanners to detect the contact wire. As a result, statistical data displays the offset and evaluates the difference in the overhead contact wire position in X, Y & Z axis. In the viewer it is possible to snap from the contact wire to point in the point cloud.

Captured LiDAR point cloud and image

A Robust Tool to Manage Assets

We developed and delivered the Railview application and system. Railview visually delivers all assets on the map dividing them into different technical and geographical placement or groups. Railview delivers an intuitive and user-friendly map-based exploration tool and database for all existing railway objects.

The innovative asset management system has many advantages over traditional data systems. Firstly, the data collection is time-efficient, comprehensive and replaces on-site surveying that would require many weeks in a high-risk environment. Moreover, the image capture component allows for visual inspection and verification of attributes, models or material. The LiDAR component allows for deriving height, length and much more thorough the precise position of the asset. 

This project completely changed the client’s traditional way of collecting and inspecting data and opened up new possibilities in WSP’s other projects, for example crack detection in concrete tunnels in the Singapore Transit Authorities railway system, in dangerous or hardly accessible environments, like tunnels and highways.

Our team delivered the following services:

  • Mobile mapping
  • Asset inventory and analysis
  • Digitalization of available rail documentation 
  • Web-based system for asset management
  • Free-Space and Clash-Detection Measurements
  • Catenary and Overhead Contact System Analysis