Spain's Rail Paradox: Overbuilt High-Speed Lines, Underfunded Networks 2026

Spain's high-speed rail network, particularly the AVE system, has expanded rapidly since the early 2000s, but according to engineer César Franco, this expansion may have come at the expense of more critical investments. In a recent interview, Franco, who directs the Master's in Industrial Engineering at Universidad Alfonso X el Sabio, argues that Spain has swung from overbuilding to underinvesting, leaving a mixed legacy for the country's transport infrastructure.

Franco's comments come amid ongoing debate about the state of Spain's railways, including the recent Adamuz accident, the liberalization of passenger services, and the perceived inadequacy of many infrastructure links. His perspective offers a critical lens on how political priorities and public perception have shaped the country's rail network.

The Boom and Bust of Spanish Infrastructure Investment

From the late 1990s through the mid-2000s, Spain invested heavily in infrastructure, including highways, airports, and high-speed rail lines. This period was marked by a desire to showcase modernity and political prestige, sometimes at the expense of economic rationality. Franco describes it as a phase of "oversizing," where projects were often driven by territorial political balance or public impact rather than social profitability and real traffic demand.

After the 2008 financial crisis, investment plummeted. According to Franco, the reaction to earlier excesses led to a prolonged period of investment paralysis. "We went from a stage of oversizing to one of investment paralysis," he says. This shift has left Spain with a network that is both extensive in some areas and insufficient in others, struggling to keep up with population growth and changing mobility needs.

The AVE Paradox: High-Speed Lines with Low Traffic

One of the most striking examples of misallocation, according to Franco, is the construction of high-speed lines that see very few trains per day. "If we spend hundreds of millions so that three AVE trains circulate per day, we are making a mistake," he asserts. This situation reflects a broader issue: the pursuit of prestige projects over cost-effective, high-demand services.

While the AVE network has connected major cities and reduced travel times, many lines operate well below capacity. The opportunity cost is significant: funds spent on underused high-speed rail could have been directed toward maintaining and modernizing the conventional rail network, which serves more passengers and freight but has suffered from neglect.

Liberalization and Its Impact on Rail Services

The liberalization of Spain's passenger rail market, which began in earnest in 2021, has introduced competition on several high-speed routes. Companies like Ouigo and Iryo now compete with Renfe, driving down prices and increasing frequencies on popular corridors such as Madrid-Barcelona and Madrid-Valencia. However, Franco's concerns about underused lines suggest that liberalization alone may not solve the structural issues facing the network.

Competition has focused on the most profitable routes, leaving less-trafficked lines dependent on public subsidies or facing service cuts. This raises questions about equity and the role of the state in ensuring connectivity across all regions, not just those with high demand.

What Went Wrong and How to Fix It

Franco identifies several key missteps in Spain's rail planning. First, the emphasis on new construction over maintenance and upgrades of existing lines. Second, the lack of a comprehensive, data-driven approach to project selection. Third, the politicization of infrastructure decisions, which often prioritized ribbon-cutting ceremonies over long-term viability.

To move forward, Franco advocates for a more balanced approach: investing in the conventional network to improve reliability and frequency, while carefully evaluating new high-speed projects based on actual demand and economic return. He also stresses the need for better integration between rail, road, and other modes of transport to create a seamless mobility system.

• Overinvestment in high-speed rail has led to underused lines with high maintenance costs.
• Conventional rail and regional services have suffered from neglect, affecting daily commuters.
• Liberalization has benefited major corridors but risks leaving less-profitable routes behind.
• Political prestige often trumps cost-benefit analysis in infrastructure planning.
• Future investments should prioritize maintenance, digitalization, and integration with other transport modes.

Comparing Spain's Rail Network to Other European Countries

Spain's high-speed rail network is the longest in Europe, with over 3,900 kilometers of track. Yet, when compared to countries like France or Germany, the intensity of use is lower. The table below illustrates some key differences.

Note: Data is approximate and for illustrative purposes. Spain's lower passenger numbers and train frequencies on high-speed lines highlight the underutilization of its network. The longer history behind the story is traced in Spain Rejects EU Plan to End Iberian Rail Gauge Exception.

The Road Ahead: Balancing Investment and Demand

Spain faces a critical juncture. With a population that has grown by nine million since the early 2000s, the demand for efficient transport is higher than ever. Yet, the investment gap since 2010 has left many infrastructures feeling inadequate. Franco's critique serves as a warning: continuing to build high-speed lines without considering actual usage will only deepen the problem. The background to this story is set out in Renfe's Rail Paradox: Burgos Demands More High-Speed Trains. A related thread runs through Almería: Spain's City Most Punished by Renfe Rail Cuts. Earlier coverage in Spain's New Gold Mine in Europe: Poland's €32 Billion Rail Revolution shows how the argument developed.

Instead, a focus on upgrading existing lines, improving frequencies, and ensuring equitable access could yield better returns. The debate over the Adamuz accident and the state of infrastructure further underscores the need for a thorough review of safety and maintenance standards. A closer look at the same subject appears in Spain Train Crash in Toledo: At Least 10 Dead in High-Speed Rail. Anyone following the wider picture can start with Spain's LZB Rail System Failures: Minister Calls 170 Outages Normal. The same theme surfaces in Spain's Basque Y High-Speed Rail: Seven Viaducts in Seven Kilometers, which takes a different angle.

As Spain navigates its transport future, the lessons from the past two decades are clear: infrastructure should serve people and the economy, not political agendas. By adopting a more pragmatic approach, Spain can build a rail system that is both efficient and sustainable. Context on how this played out before sits in Basque Y High-Speed Rail: A 600-Person Town's Empty Station. A companion piece, High-Speed Rail Revolution: Why Britain Lags Behind Global, approaches the same subject from another angle.