5G Intelligence Underpinning Railway Safety in the COVID-19 Era

The COVID-19 pandemic has impacted all global transportation systems and the rail industry has been no exception. Indeed, the rail industry has been severely affected (Metropolitan Transportation Authority, 2020), as passengers tend to stay away from the trains. Moreover, because of the COVID19 lockdown, there have been changes in passenger behavior. According to a United Kingdom-wide survey commissioned by the Department for Transport and undertaken inMay–June 2020, there has been a significant drop in traveling and a loss of confidence in traveling by train (Marshall et al., 2020). Even with the rail business facing this low demand, they are still required to offer services regulated by enhanced health and safety standards to protect the public, passengers, and the workforce from possible infection. However, due to the pandemic, train operators have faced unique difficulties in meeting these regulatory requirements (Stephanie, 2020). As a response to the challenges faced, artificial intelligence (AI) technology has been suggested as one possible tool to help address the current and future situations such as a pandemic. Of course, AI has already been used in many areas of the rail industry, for example, in real-time, predictive, decision support, and here, it has proved to be a powerful tool. Now, in the case of COVID-19, innovative digital explications may contribute to dealing with social distancing and managing stations, crowds, and train occupancy, including customer apps, smart CCTV, and the big data for safety health services (International Union Railway-UIC, 2020). Moreover, big data can be beneficial in terms of risk assessment, supporting the decision-makers in real time, reducing human errors, predicting hazards, and raising safety and security efficiency while also reducing the cost. This method can be fully integrated into passenger data and business models (Alawad et al., 2019). AI is a powerful tool, and it seems to have some useful features that could be employed in the fight against the COVID-19 pandemic. The AI applications have been seen in airports in thermal and vision imaging, and this control measure provides valuable data input for public health in identifying the possible afflicted people in crowds and detecting passengers who are not wearing masks. Also, AIbased computer vision has been used for social distancing measures and to detect suspicious individuals. Technologies such as AI applications and sensors with biometrics have a significant role in detecting fever and a temperature and diagnosing and tracking geographical induction spread and public health and safety monitoring. This could also be applied in other public areas such as railway stations, including their platforms and entrance areas. Some ideas have been raised where AI can fight COVID-19 using early warnings and alerts, tracking, recognition, prediction, and social control (Naudé, 2020). Furthermore, AI applications have been used in the field to detect and implement social distancing and wearing of facial coverings and to detect whether workers are wearing their personal protective equipment (PPE), such as helmets or gloves (Wykle and Van Hecke, 2020). In addition, it may even be possible to forecast the next epidemic from the COVID-19 history mobile network data. Edited by: Ampol Karoonsoontawong, King Mongkut’s University of Technology Thonburi, Thailand


INTRODUCTION
In this article, it is discussed whether, in the context of COVID-19, the railway industry could employ new technology such as AI and related approaches (Internet of things (IoT), 5G, big data, and AI) for protecting and underpinning railway safety. Acknowledging already the solutions and potential measures that have been applied such as cleaning, disinfection, sanitization, redesign, physical and social distancing, relayout, ATP testing, or the air filtration and recycling air, we are attempting here to highlight the potential technology solutions in the industry for tackling COVID-19.

CCTV AND COVID-19
Detecting the possibly affected people is key to tackling the spread of COVID-19. In railway stations, this could be achieved with the help of CCTV cameras and other tools such as biometric screening using infrared systems. To achieve this, AI requires massive data to learn and predict, which are available as raw data in the field but need effort and structural strategies for gathering suitable data. The information can be captured through indicators or indices, which create the rules depending on the inputs. The necessary inputs can be collected from devices, such as sensor-based programming or CCTV, and the estimate can be calculated with AI methods and generated from servers.
In railway stations, CCTV is already playing a role in monitoring for security, safety, and health in the COVID-19 context. It has also been used for restrictive measures such as wearing masks and social distancing and can provide accurate accounts of the number of people in specific places. The image or video input is important raw data that can be analyzed via AI technology to predict the risks. This approach is increasingly driven by GPU computing developments with methods of machine and deep learning (ML-DL) applications (Alawad et al., 2020b).
In the United Kingdom, for safety and protecting human resources in the railway, some of these methods have already been implemented. Thermal cameras have been installed in critical locations of Network Rail. The body temperatures can be detected on entry to the site and the cameras can measure up to 30 people simultaneously (Thales Mobility Team, 2020). However, the temperature symptoms may not be sufficient in detecting COVID-19 and there is a shortage of customized cameras for the railway system. Nevertheless, these intelligent thermal imaging cameras provide reliable, accurate (±0.3°C) measures of COVID-19. The thermography smart cameras can detect the individual body temperature level without contact and give an alarm for a specific threshold. These systems can be integrated into a related control system such as a smart helmet (Mohammed et al., 2020) or glasses and algorithms of video analysis. They can be used in UAVs that can cover and investigate large crowds of people seen at the stations and the platforms (UIC Covid Task Force, 2020).

AI AND RAILWAY STATIONS
AI also has operational intelligence for managing, for example, overcrowding in the stations, which can control the spread and assist in reducing COVID-19 transmission. It is more imperative to control and prevent overcrowding risks quickly and in real time in places such as railway stations and platforms. In this context, the importance of prediction has been referred to and is now more pertinent than any time in the past as crowding has led to the spread of COVID-19 and thus affected the safety, security, and health concepts and strategies (Alawad et al., 2020a). Managing the crowd reflects the space between the passengers and provides a safe flow in the station's different points, such as platforms or the narrow sides, which is required to protect the passengers and staff from COVID-19 and other health and safety issues.

INTELLIGENT INTERNET OF THINGS AND 5G
The sensors can be wearable (on-body sensors), connected to a machine or device or asset and then connected to a network that provides information. After that, from this information, you can do advanced management and analytics, which is the concept of IoT that connects people and things. This requires high-speed data transmission, lower latency, high resolution, a more reliable connection, and real-time services and operation. 5G is beginning to expand across the world and there is a great deal of research being conducted regarding its viability and challenges in terms of regulation, battery drain on devices, coverage, the licensed band (Lu et al., 2019), security and privacy (Khan et al., 2020), and the cost of infrastructure and upgrading devices to be compatible with 5G. Still, 5G seems to be offering numerous opportunities and supports others, such as its coexistence with Wi-Fi 6 (Oughton et al., 2020), IoT, applications based on virtual reality, augmented reality with lower latency, higher capacity, high speed, and reliability (Ding and Janssen, 2018), and enhancing users' perceived quality of service/experience (Agiwal et al., 2016). Moreover, it provides higher data rates and enables technologies such as IoT and AI applications, improves railway environments by making them smart, uses advanced wireless access and connectivity, including operational, control, commercial, and both passenger and high-speed railway (HSR) communication requirements. Furthermore, 5G can support more devices with seamless mobility, offer higher bandwidths, use licensed and licenseexempt spectrum, and provide widespread indoor and outdoor coverage and lower latency for end-users (Soldani, 2020). Additionally, these railway service improvements could encourage the public to choose the railway to travel, especially as it is a low-carbon transport and enables passengers to reduce their total carbon footprint.
It is expected that 5G and other advanced networks in the future will provide faster and faster connectivity and more capability with the growth of applications of IoT, AI, cloud, and edge computing.
Such applications lead to smart things, cities, retail, intelligent stations, and other smart applications. This intelligent monitoring connects hundreds of thousands of sensors, devices, people, and operations for gathering big data for predictive, analytical, control, health, safety, security, and autonomous applications via synchronization systems on 5G and the cloud (see Figure 1). This approach is an integration model and can be a contributor to the transportation business models of the future, such as the concepts of the door-to-door and Mobility-as-a-Service platform. Globally, 5G or beyond (B5G or 6G) has been noted as a connectivity network approach aiding in effectively managing infectious diseases such as COVID-19, which has a faster bitrate, greater capacity and volume, reduced latency, and a large amount of IoT handling. In addition, it fulfills the connectivity criteria of machinery, remote control, driving operations, accessibility, realtime UHD image transmission via 5G-networked UAVs, quality inspection, device detection, and automatic identification via Unmanned 5G AGVs (Automatic Guided Vehicles).
5G applications have been deployed to cover COVID-19, for instance, to track passenger conditions in traffic centers, and 5G IT-based infrared temperature monitoring has already been used in a variety of cities (Shamim Hossain et al., 2020).
The integration of IoT with the cloud and AI in the public transportation locations such as railway stations and airports will generate a robust, broad range railway control environment for enhancing health, safety, and security. For instance, it can help track individuals who are diagnosed with COVID-19 who may be out and around the city, including the railway, and who may later become sick.
Network Rail in the United Kingdom supports the next generation of digital technology for smart infrastructure in coping with the expected growing demand, and a 5G and fullfiber broadband Trials Program has been conducted. This rail industry improvement of communication will reflect on many aspects, such as increased capability, flexibility, automation, and autonomy.
Moreover, it is expected that 5G will increase environment and asset sensing to improve the availability of actionable intelligence insight and increased predictability and reliability with high levels of safety and security (Rail Network, 2019).

DISCUSSION/CONCLUSIONS
Data availability, privacy, and security remain a challenge for applying AI in the railway industry. In addition, future investment in the infrastructure of rail will bring new technological transportation competitors such as autonomous vehicles or hyperloop trains and other technological inventions. This will force the redesign of strategic plans and may create some fear because of the future new technologies in the field, such as hydrogen passenger trains. Nonetheless, it is expected that after COVID-19, there will be an acceleration in the shift from air to rail in Europe and China because of climate awareness and because rail is healthier and less risky in relation to disease, all of which will improve the rail market (UBS, 2020).
The applications that have been used so far in AI are now playing a vital role in the fight against COVID-19, and the shortage of data has been acknowledged. Notably, the railway FIGURE 1 | Illustration of how the smart systems integrate the cloud, 5G, and IoT into the outlined health, safety, and security framework of the railway system. needs to be ready for this revolution of technology in terms of infrastructure such as the cloud, regulations and standards, communication systems, corporations, and skills. The AI applications and IoT need integration with the communication systems to comply with the high data rate for the railway system, thus improving the system to handle the tremendous rate of data such as HD video, which requires 5G as essential for upgrading to the 6G or combining 5G with Wi-Fi 6. Innovative technologies such as wireless sensors, IoT devices, and passenger apps are beneficial not only for cases of COVID-19 but also for making more effective decisions and enhancing security, safety, and health in organizations. The big data from IoT via 5G is exemplary for AI exploitation. The advantage of minimum users or less human intervention is the core for protection from COVID-19, which can be delivered from IoT. For smart railway stations, it has been suggested that it is possible that the same concept of the smart cities can also be applied to railway stations. The railway station innovation, data businesses, and services will add extra value to both, for instance, sharing and tracking information related to the pandemic between the NHS and the railway. Generally, the leading smart criteria in the stations include smart mobility, infrastructure, and management, so that all technologies such as AI, cloud, 5G, and IoT together can play a vital role in the health and safety of the railway industry future. No doubt, in the future, the AI and revolution of data technology will be a part of the rail industry providing essential contributions (Alawad and Kaewunruen, 2018). Moreover, the demand and usage of face technologies such as computer vision, CCTV, face recognition, and Iris of the eye linked with AI algorithms are expected to increase. This has already proven to be an accurate and safe method of timely monitoring with less human intervention, which can help provide a safe social distance in the case of COVID19. To sum up, we ask again whether the industry will be more competent in the face of future pandemics. If the lessons are learned, the answer will be yes. Finally, COVID-19 has led to rethinking how we consider and continue to benefit from technology in the current situation and for future crises, not only for the railway but for all businesses.