AI on the rails: efficiency in metro transport

Column

Innovation

December 15, 2025

AI on the rails: efficiency in metro transport

Automated control, predictive maintenance, and personalized passenger experience consolidate technology as an engine of innovation in the sector

The railway transport is one of the fundamental pillars of modern urban mobility. In large cities, the subway represents an efficient, fast, and sustainable means of transport, responsible for connecting millions of people daily. According to guidelines from the Union Internationale des Transports Publics (UITP) and the World Bank, high-capacity systems like the subway are essential for reducing congestion and the emission of pollutants into the urban atmosphere.

However, growing demand, operational challenges, and user expectations for quality and reliability require systems to continuously modernize. In this context, artificial intelligence (AI) emerges as a strategic tool, aligned with the recommendations of ISO/IEC 42001:2023 (international AI management standard), capable of optimizing operations, reducing costs, improving passenger experience, and increasing safety, through technologies that help computational systems perform tasks that would traditionally require human intelligence, such as pattern recognition, decision-making, prediction, and learning from data.

Applications

One of the main applications of AI in subways is the automation of train operations. Many cutting-edge systems — such as those in Paris, London, Singapore, and Hong Kong — follow the technical standards of IEC 62290, which defines the GoA (Grade of Automation) levels. GoA4, in which the train operates without a driver, uses AI systems that continuously process information from sensors, cameras, and signaling to adjust speed, braking, and stopping, ensuring maximum energy efficiency and safety.

Another relevant application is predictive traffic control. This type of solution is aligned with the best practices recommended by the Institute of Electrical and Electronics Engineers (IEEE), especially in the standards for intelligent transportation systems (ITS).

Using machine learning algorithms, systems can predict the flow of passengers at different times and stations, automatically adjusting the interval between trains. This allows the subway to operate with greater regularity and avoid overcrowding during peak hours. Furthermore, AI can integrate external data — such as sporting events, weather conditions, or traffic incidents — to anticipate variations in demand and plan rapid responses.

Predictive maintenance and reliability

Traditionally, metro systems perform preventive maintenance based on fixed schedules. However, this model is not always efficient, as it can lead to the unnecessary replacement of components still in good condition or the unexpected failure of parts before their scheduled review.

AI-based predictive maintenance is revolutionizing this practice. Through the collection and analysis of data from sensors installed on trains and track equipment — such as engines, brakes, rails, and electrical systems —, artificial intelligence algorithms identify wear patterns and anomalies before they cause failures. This allows for more precise planning of interventions, reducing unscheduled downtime and unnecessary maintenance costs. Furthermore, it increases service reliability, as problems are proactively solved.

A practical example of this application is the use of machine learning models to predict the degradation of train axles, brake wear, and track condition. The system “learns” from historical data and continuously adjusts its predictions, indicating the ideal time for each repair. Cities like London and Tokyo already widely use this type of technology in their subways.

Security and surveillance

Artificial intelligence is also a powerful tool in passenger security, especially with the use of computer vision and intelligent video analysis. Cameras equipped with AI algorithms can detect suspicious behaviors, accidental falls on platforms, presence of abandoned objects, and even signs of medical emergencies, such as fainting.

These systems can automatically trigger control centers, allowing for immediate responses from security or relief teams. Furthermore, AI helps optimize human monitoring, reducing the need for operators to watch dozens of screens simultaneously. Thus, surveillance becomes more efficient and less susceptible to human error.

Another important advance is the use of AI for prevention of operational accidents. Sensors and cameras in tunnels and stations can identify obstacles, undue intrusions on the tracks, and abnormal variations in environmental conditions (such as smoke or excessive heat). The system then automatically alerts central control, avoiding risks before they become critical.

User experience

Beyond operational improvements, AI also plays a growing role in the passenger experience. Chatbot systems and virtual assistants can provide real-time information on schedules, routes, delays, and transportation alternatives, both in applications and on totems installed at stations. These assistants are capable of interacting in natural language, making communication simpler and more accessible.

AI is also used for the analysis of user behavior, based on electronic ticketing data and presence sensors. This information helps operators understand displacement patterns and optimize information campaigns, works, and improvement actions. In some cities, visual information systems adapt the content displayed on station panels according to the profile of users present at the location and the real-time operational situation.

Energy efficiency and sustainability

Energy consumption is one of the main operating costs of a subway. Artificial intelligence can significantly reduce this expense through optimized automatic driving algorithms, which adjust acceleration and braking according to the terrain, the weight of the train, and the interval between trains. This technique, called automated eco-driving, allows for significant savings in electrical energy and reduced wear on mechanical components.

Furthermore, AI systems can also optimize the use of lighting, ventilation, and air conditioning in stations, adapting their operation according to the flow of people and weather conditions. This intelligent management contributes to a more sustainable operation, with less environmental impact.

Challenges and perspectives

Despite the advances, the adoption of artificial intelligence in rail transport still faces challenges. The integration of legacy systems, high initial implementation costs, the need for qualified professionals in data analysis, and cybersecurity are critical factors. Furthermore, it is essential to ensure that the use of passenger data follows ethical and privacy principles.

However, metros are expected to become increasingly autonomous, integrated, and intelligent systems. The concept of a “digital metro” — in which all operational decisions are based on real-time data — is already beginning to materialize in cities like Dubai and Beijing.

In this way, artificial intelligence is profoundly transforming rail transport, making it safer, more efficient, and user-centered. From automated train control to predictive maintenance and personalized passenger experience, AI is consolidating itself as the engine of innovation in the sector. As cities grow and mobility demands intensify, investing in intelligent solutions is no longer an option but a necessity.

Subway transport in Brazil

The Brazilian subway network, added to light rail and monorail systems, is concentrated in a few metropolitan regions and represents a reduced percentage of the national public transport demand. Expansion occurs slowly, marked by funding discontinuities, changes in government, limitations of federal investments, and dependence on complex models of PPPs and concessions.

Despite this, some systems stand out for their efficient operation and technological advancement, especially that of the São Paulo Metro, a continental benchmark in reliability, fare integration, and advanced traffic control. The main challenges faced by the sector in Brazil are:

  • Institutional fragmentation: the division of responsibilities among States, Municipalities, and the Union hinders the full integration between subways, metropolitan trains, and buses, in addition to generating decision-making slowness;
  • Dependence on complex financing models: PPPs and concessions are important, but often face legal insecurity, regulatory risks, and economic instability;
  • Low operational digitalization: some systems still operate with legacy signaling, traffic control, and ticketing technologies, which limits the adoption of advanced AI solutions;
  • Socio-spatial and urban challenges: expansion into peripheral areas — where demand is high, but income is lower — requires public policies that reconcile financial viability and social inclusion;
  • Operational security and cybersecurity: technological modernization increases vulnerability to cyberattacks and requires continuous protocols and training.

Strategies for the Future

The creation of a National Rail Program is the first essential step, because, just as occurred in the Brazilian energy and telecommunications sectors, rail mobility needs a federal framework for permanent financing, with expansion goals for 10, 20, and 30 years. Subsequently, strengthening metropolitan integration becomes equally important, which involves adopting a single ticketing system and integrated line planning, ensuring greater efficiency in the system.

Furthermore, the incentive for sustainable PPP models requires special attention to regulatory stability, revenue predictability, the Union’s participation as guarantor, and contract standardization, ensuring governance and legal certainty.

None of this, however, eliminates the need to maintain focus on social equity and inclusion, so that metropolitan projects prioritize connections with dense peripheries, promote a more balanced distribution of supply, ensure affordable fares, and articulate policies that integrate urban development and transportation.

Finally, AI-based technological modernization plays a decisive role in this set of guidelines, involving the adoption of CBTC systems and automation at GoA2, GoA3, and GoA4 levels, the use of energy optimization algorithms and the implementation of integrated predictive maintenance, in addition to intelligent video analysis systems and integration with smart cities and urban data.

Perspectives

Brazil has the potential to transform its metro-rail networks into modern, efficient, and intelligent systems. The convergence of structural investments, integrated metropolitan policies, and emerging technologies — especially artificial intelligence — can generate a new era of urban mobility, aligned with the social, environmental, and economic needs of Brazil’s major cities.

With continuous planning, stable governance, and technological innovation, the country is in a position to expand its rail network, improve the quality of public transport, and build a more sustainable and accessible future. The metro of the future will inevitably be a metro powered by intelligence — not only by its machines, but by the harmonious integration of technology, management, and quality public service.

Who wrote this column

Pedro Henrique Fabri Zanini

É gestor público com mais de 15 anos de experiência na administração pública, com atuação em Gestão de Contratos e Licitações, Administração Financeira e Orçamentária, ESG, cidades inteligentes e governo digital. Possui mestrado em Administração Pública, MBA em Gestão Pública, pós-graduação em Direito Público e graduação em Administração de Empresas. É professor orientador na USP/Esalq, autor de questões de concursos públicos para bancas examinadoras, escritor e membro do CRA/SP.

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