July 16, 2018

Bridging the big data gap

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Railways are harvesting increasing volumes of data on the performance of their assets, but converting raw data into meaningful insights remains a challenge for many organisations in the industry. Keith Barrow reports from Munich on how suppliers, tech companies, train operators and infrastructure managers are harnessing the power of data through advanced asset management systems.

THE answer to the Great Question of Life, the Universe and Everything is 42. After seven-and-a-half million years of calculations, this was the conclusion delivered by Deep Thought, a supercomputer in Douglas Adams’ novel “The Hitchhiker’s Guide to the Galaxy.” When Deep Thought’s hyper-intelligent pan-dimensional creators contest her findings, she replies: “I think the problem, to be quite honest with you, is that you’ve never actually known what the question was.”

Insights july18This visionary tale was written long before the advent of big data, but it carries a message pertinent to the modern railway - data in isolation has no meaning, and the real value lies in how it is used. Infrastructure managers and train operators harvest increasing volumes of data about their assets and this is the starting point for potentially transformative insights which could have profound implications for the way railways operate. But in a world where assets are becoming more and more digitally interconnected, extracting meaningful insight from the terabytes of data streaming in from billions of data points on trains, track and signalling systems is a hugely challenging task. Digitalising asset management and digitalising assets must therefore move forward in unison if the potential of data is to be unlocked.

“If rail wants to survive competition with driverless cars, we need to fundamentally change the way we operate,” Mr Gerhard Kress, director of mobility data services for Siemens, told delegates at Rotaia Media’s The Rise of IoT and Big Data in Rail conference and exhibition, which was held in Munich on May 29. “It’s essential to focus on creating value and not just harvesting huge amounts of data, because data alone is only cost. The real benefit comes when you can turn it into insights. Everything we do around data has no value unless it results in tangible benefits for the customer.”

According to Mr Matthew Miller, global transportation industry principal for OSIsoft, market hype around the potential for big data is being driven by four technological megatrends:

  • pervasive, cheap, and small sensors
  • declining computing and data storage costs
  • new abilities to process and analyse data, and
  • ubiquitous connectivity.

Miller says the convergence of these key enablers is driving the adoption of IoT in rail, and with it demand for analytic applications to turn data into operational intelligence for better decision making. However, he warns that organisations need to be able to cope with variation in data quality. “Real data isn’t perfect and data quality is a killer issue for every project,” he says. “Communications failures, spiking sensors, calibration issues and out-of-sequence data can all cause massive problems and you need to consider how you will deal with these issues.”

As the volume of data increases and ever more devices become connected to the IoT, centralised processing of data could become impractical and it may be necessary - even desirable - to transfer processing capability out into the field. Edge computing - moving the processing of data closer to the IoT devices that created it - is currently a focus for IoT firms around the globe. Earlier this year Britain’s Department for Transport selected rolling stock leasing company Angel Trains and British edge computing specialist Virtuosys to demonstrate an onboard edge computing solution.

The project involves installing a number of Virtuosys Edge Servers to create a mesh network together with local storage and processing. The system will be designed and certified for deployment on a British passenger vehicle, with an initial preloaded set of applications, targeted at the rail industry. The solution will be capable of operating with an intermittent backhaul connection to the internet, and applications will be able to provide useful functions during travel, even without internet access. Open interfaces will be provided to encourage application development by third parties.

Virtuosys says that deploying a handful of devices in each vehicle will create a self-managing network, sharing all computing and processing power. This will support technical and operational applications while also improving onboard connectivity for passengers.

The sensor industry is also working to move computing power closer to the data source. “Analytics is a challenge,” says Mr Michael Thiel, CEO of Frauscher Sensor Technology. “With artificial intelligence (AI) a lot will be possible, but where should we place the analytics for that? A sensor network monitoring 40km of track can generate a terabyte of data in an hour, so we need to reduce it to the point where it can be handled easily. That’s what we’re working on now - shifting intelligence closer to the track.”

Efficient maintenance

Condition-based maintenance (CBM) is a key business driver for digitalisation in the rail sector. According to The Rail Sector’s Changing Maintenance Game, a report published by McKinsey in December 2017, CBM can reduce rolling stock manual diagnostics by at least 60% and could lead to an overall reduction of at least 10-15% in maintenance costs - equivalent to an annual saving of up to €4bn for train operators, €2bn for rolling stock OEMs, and €4bn for third parties.

According to Perpetuum, which develops asset management solutions for rolling stock, 9-12% of total vehicle operating costs are spent on bogie maintenance and lifecycles can be extended significantly with the aid of remote condition monitoring (RCM). “We are burning millions of euros replacing assets that are not life-expired,” explains Perpetuum’s global sales director, Mr Robert Mulder. “If the condition of every single bogie was known, we would be able to extend overhaul intervals by 25-75%. With vibration, the start of degradation is already picked up six to seven months before the asset is replaced.”

Perpetuum has developed a ‘fit-and-forget solution’ which is self-powered by vibration and has a ‘maintenance-free’ design life of 20 years. The technology enables remote monitoring of wheels, bearings, brakes, axleboxes, traction motors, and track quality in real time. Bespoke algorithms in the cloud provide the operator with real-time status updates.

“You have to do more than simply implement RCM,” Mulder says. “To gain the potential benefits, processes need to be in place. No technology project is going to generate a return on its own.”

For OEMs looking to build their aftermarket business, asset management has become a key focus in recent years and suppliers are helping their customers to bridge the gap between raw data and meaningful insights into asset status and performance. Siemens uses its Railigent platform to remotely monitor gearboxes, bearings and traction motors on Velaro high-speed trains, as well 5000 doors on the Desiro City commuter EMU fleet used on London’s Thameslink network. Siemens has also used machine learning to predict bearing failure on high-speed trains and high-end data analytics to predict point machine failure without the need for additional sensors.

Siemens is working with third-party suppliers to integrate their applications into Railigent. The company recently signed an agreement with Voith to develop a monitoring solution for its Scharfenberg coupling and it is also working with SKF to integrate its Insight Rail CBM solution with Railigent to optimise bearing maintenance.

According to McKinsey, railway companies should be looking to initiate three short-term steps to begin preparing for condition-based and predictive maintenance:
1. Define a strategically appropriate target state and structure data partnerships accordingly, assessing current preparedness for CBM, setting goals and establishing where data ownership lies
2. Create a physical space to bundle engineering and analytics know-how pulling together relevant experts from the siloed functions of procurement, fleet management and maintenance planning, and
3. Commit to “value-chain-wide” digitalisation, upgrading the entire maintenance process with digital capabilities to optimise the return on investment.

In addition, McKinsey warns that railway companies should not underestimate the organisational challenges of cross-department or cross-company collaboration, culture clashes between data analysts and railway engineers, and the transformation of maintenance processes.

With an eye on potentially significant efficiency gains, many European railways are already working to overcome these challenges. Head of the maintenance business line for German Rail (DB), Dr Burkhard Schulte-Werning, told delegates in Munich that optimisation of conventional rolling stock maintenance practices is reaching its limits and DB’s vision is to use continuous data transmission to link its assets to its InfraView open data platform as a basis for CBM.

In a step towards this goal, DB Cargo will equip 2000 locomotives of 16 different types with telematics systems by 2020. The TechLok system collects data from the locomotive, with up to 7000 different diagnosis codes or status messages for each type. Data is transmitted in near real-time via a GSM connection for visualisation and analytics, which is used to develop use cases and transform data into actionable information and results. DB Cargo is using GE’s RailConnect 360 asset performance software as well as Siemens’ Railigent platform and MindSphere IoT system.

DB is also using scheduled trains for continuous track monitoring (CTM), with around 2500km of track now under CTM supervision using an ICE 2 high-speed train, a class 189 electric locomotive, and a class 424 EMU on the Hannover S-Bahn network.

Initiatives

In 2014 Belgian rail freight operator Lineas began experimenting with asset data with the aim of generating a competitive advantage. One of its most successful initiatives was optimising the maintenance planning of its fleet of 110 class 77 diesel locomotives, which are assigned to a variety of duties from shunting to longer-distance main line operations. The IoT solution provides data every 10 seconds and Lineas developed a dashboard to provide a complete overview of the fleet’s status. “Small and medium-sized companies were brought in to carry out analytics on the fleet and explain the problems to our bosses,” says director of assets and network operations, Mr Jeroen Spruyt. “We constructed a Know Your Locomotive view, which was used to build a predictive model of failures. This will lead to a reduction in capex of €1m on a total annual fleet running cost of €25m and will also stretch the life of the locomotives.

“We challenge people in our organisation to come up with a business case for small projects. For Lineas this is no longer a hobby. In 2014 we were playing around, today we’re building an IoT backbone and equipping our fleet with IoT solutions. To solve the questions of the future we need to start building models today.”

Netherlands Railways (NS) has established a competence centre for advanced analytics, working closely with analytics teams and experts in all other departments of the company to develop dashboards, data flows for use in business processes, and products that will benefit end users. Through this cross-department collaboration, NS has developed a model for monitoring air leakage from train brake and door systems, which reduces the need for the driver to walk alongside the train.

Another innovation is the Zitplaatszoeker seat finder app currently undergoing trials on the Arnhem - Nijmegen - Den Bosch line. The app uses a colour-coding system to display levels of seat occupancy through the train, helping customers to find a seat and ensuring a more even distribution of passengers through the train. The seat searcher uses data generated by weight sensors on the track, which were originally installed to weigh freight trains as part of a plan for weight-based track access charges.

Austrian Federal Railways (ÖBB) has harnessed big data and the company’s asset management system to support the development of its Target 2025+ long-term infrastructure strategy. ÖBB Infrastructure senior asset manager, Mr Richard Mair, told delegates in Munich that clearly defining desired outcomes at the beginning of the process was critical to successful interrogation of data.

“The objectives [of the strategy] were so big that they needed to be broken down,” he explains. “We had a lot of ambiguous data so we needed an Asset Management System (AMS) as a single point of truth providing us with a good description of the base and supporting a vision for the future. The AMS allows us to answer the questions of asset owner, and there must be a question or you cannot provide an answer. Big data is not a magic wand - before you start to search for a solution you need to know what outcomes you want.”

For ÖBB, the AMS was the enabler between raw data and business insight. “Information is one of our most important assets today and it will be even more important in the future,” Mair says. “However, data doesn’t help you at all with information. You need IT systems to aggregate and present data in a meaningful way.”

In February 2017 Dutch infrastructure manager Prorail established DataLab, which harnesses big data to develop solutions for issues affecting the performance of the network, including switch and crossing failures, track defects, signalling and train detection faults, trespassers, and stray animals. Predictive models are developed in four-week scrum cycles by a team which includes experts from relevant areas of the business with input from academic institutions, contractors, engineering firms and tech startups.

One of the first DataLab projects involved developing a predictive model for trespass, a common cause of operational disruption on the Dutch network. This looked at key influencers - environment, hotspots, weather, school holidays, and ease of access to railway property - and used machine learning to develop a predictive dashboard which could predict the risk of trespass at key locations. Police have been using the dashboard since August 2017 and incidents of trespass have fallen by 50-100% at the locations covered by the system, with a doubling of the arrest rate.

The DataLab has also developed a predictive model for switch failures, which is capable of detecting up to 20% of faults before they occur. Last year Prorail awarded machine-to-machine technology company Dual Inventive a contract to supply 1500 wireless sensors to remotely monitor the health of points and crossings, and a further 500 sensors to monitor other infrastructure systems such as level crossings.

Belgian infrastructure manager Infrabel has also embraced big data and built an analytics platform to find answers to key questions about its assets. Infrabel has developed a model to evaluate how frequently trains approach red signals in a bid to reduce Signal Passed at Danger (Spad) incidents. The resulting model integrates data on signal aspects, train movement, infrastructure and track occupancy to identify red signal hotspots and build a Spad risk index model. Big data has also been used to support a programme to reduce the number of switches and crossings on the network with the aim of improving reliability and cutting maintenance costs.

Swiss Federal Railways (SBB) has developed the Swiss Track Analysis & Maintenance Planning (SwissTamp) tool, which integrates data from various sources to provide information on asset condition, which in turn supports decision making on maintenance measures. This means planning for infrastructure maintenance and renewals can be carried out in a traceable and needs-driven manner. The tool enables visualisation and analysis of component and system data and provides site-specific prognoses of future maintenance requirements. SBB says SwissTamp is playing a key role in the transition towards preventative maintenance on the Swiss rail network.

These initiatives demonstrate the central role of asset management systems in turning data into insight. Organisational factors are also key - success depends on a company’s ability to fuse traditional railway disciplines with data science and adapt to new ways of working. Most importantly, big data can only provide an answer if there is a question, and a clear focus on the desired outcome is essential if the transformational potential of big data is to be realised.

 

Shift2Rail project focuses on smart maintenance

A €1.5m research project has been launched as part of the Shift2Rail Joint Technology Initiative which aims to optimise rail vehicle maintenance processes through the integration of predictive data analysis algorithms and online optimisation tools within a condition-based maintenance (CBM) strategy.
The maintenance element of the Smart Maintenance and the Rail Traveller Experience (Smarte) project will focus on the use of information and modelling to reduce lifecycle costs and improve vehicle availability and performance through CBM.
Objectives include:

  • review and benchmarking of current CBM practices in other sectors, including aviation
  • development and integration of reliability ontology
  • development and integration of predictive tools for current and future condition of rolling stock components
  • development of optimisation tools to support decision making, and
  • application of a CBM model to two real-world case studies on rolling stock components.

The 28-month project is due to conclude in December 2019.

 

 

 

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