From BuTX to Ulsan Link: Why Rail Alone Won’t Fix Regional Imbalance

Busan, South Korea — The Busan–Ulsan–Gyeongnam (BUG) region has placed high hopes on a series of new rail projects, from the BuTX express line crossing Busan to the long-discussed link between Busan and Ulsan. Regional leaders describe these projects as the foundation of a “one-hour living zone” and the first step toward balanced development outside the capital. Billions of won in public funding are being directed to these corridors, and political rhetoric has framed them as critical to reversing population decline and restoring competitiveness.

Yet the assumptions behind this narrative are far from settled. Experience from the Seoul metropolitan area, where the GTX lines triggered real estate speculation but did little to ease concentration in the capital, suggests that transport infrastructure alone rarely changes the direction of migration or economic gravity. Demographic data show Busan has already fallen behind Gyeongnam in population size, and the region faces structural challenges—aging, shrinking university enrollments, and the erosion of industrial bases—that trains by themselves cannot resolve.

The question is whether BUG’s new rail lines can truly act as instruments of regional revival or whether they will repeat the pattern of infrastructure-led promises that inflate property markets while leaving deeper structural issues untouched.

Building a One-Hour Living Zone

The centerpiece of Busan’s transport ambitions is the BuTX express line, a deep-underground railway designed to connect the city’s new airport zone at Gadeok to its eastern coastal resorts. The proposed route would pass through major nodes including Myeongji, the North Port redevelopment area, Centum City, and Osiria. Travel across Busan, a journey that now takes more than an hour by car in peak traffic, is projected to shrink to under 30 minutes. City officials present BuTX as a breakthrough project that can anchor Busan as the core of a wider southeastern economic zone.

In parallel, the Busan–Yangsan–Ulsan line has been under preparation for years. Stretching nearly 50 kilometers with 11 planned stations, it would link the northern edge of Busan to Ulsan’s KTX station in about 50 minutes. This connection is meant to close a long-standing gap: while the three cities together host more than six million people, their transport links have been limited mostly to highways. The rail project promises to integrate fragmented commuter flows and allow more direct connections between industrial and residential zones.

Local governments in Busan, Ulsan, and Gyeongnam have treated these lines as the physical foundation of the so-called “one-hour living zone,” a concept designed to counterbalance the capital’s dominance. Policy documents emphasize reduced commuting times, higher labor mobility, and potential synergies between ports, heavy industry, and new service sectors. But the political context is just as important. Announcements about BuTX and the intercity link have repeatedly coincided with election cycles, reflecting how large-scale rail projects double as campaign platforms.

When Fast Tracks Fuel Real Estate, Not Balance

The Great Train Express (GTX) network in the capital region was promoted as a solution to long commutes and as a way to spread development across the wider metropolitan area. Three core lines—A, B, and C—are under construction, with extensions already proposed, supported by more than 38 trillion won in public investment.

The immediate effects were most visible in real estate. Station areas such as Dongtan and Wirye saw property prices rise sharply after announcements, with much of the value driven by expectations rather than completed service. The “GTX premium” became a shorthand in housing markets, but the benefits were uneven. Districts included in the plan gained investor interest, while surrounding areas without stations fell further behind.

On the broader scale, the network has not slowed the concentration of people and jobs in Seoul. If anything, improved access reinforced the capital’s centrality by making daily commuting from distant suburbs feasible. The result was an expanded Seoul labor market rather than a rebalancing of national population flows. The promised role of GTX as an equalizer for the wider country has not materialized.

The lesson for Busan, Ulsan, and Gyeongnam is that large-scale rail projects can raise property values and extend commuting zones, but without accompanying measures—such as job creation, university renewal, and industrial diversification—they do little to reverse demographic decline. The GTX experience underscores the limits of transport infrastructure as a stand-alone tool for balanced development.

Seoul vs. Busan Subway Networks

Seoul’s metropolitan rail system is one of the most extensive in the world. The network spans more than 350 kilometers within the city and stretches across the wider capital region through commuter lines that integrate with national rail. This density means that most neighborhoods fall within a ten-minute walk of a station. It also underpins the multi-core urban structure of the capital area: Gangnam, Yeouido, Jamsil, and satellite cities such as Bundang and Ilsan all grew around reliable rail access. For residents and firms, this connectivity translates into lower commuting costs, easier labor mobility, and a wide range of residential and commercial options.

Busan’s system, by contrast, is far smaller and more limited in reach. With roughly 200 kilometers of track across four main subway lines and a handful of light rail extensions, coverage remains uneven. Large residential districts such as Gijang’s Jangsan or Yangsan’s Wondong are still outside the subway grid. Many lines follow the city’s coastal and river corridors, leaving hilly or peripheral areas poorly served. Where Seoul’s network created near-universal station access and spurred new sub-centers, Busan’s has mostly followed growth rather than shaping it. Neighborhoods not connected to the subway, despite substantial housing development, often face congestion and weaker commercial activity.

The contrast highlights why rail infrastructure plays different roles in the two cities. In Seoul, subway expansion reinforced the capital’s attraction by distributing activity across multiple hubs while keeping them tightly connected. In Busan, the limited network has left some districts isolated, reinforcing uneven patterns of growth. This helps explain why younger residents see fewer lifestyle and employment advantages compared to the capital region. Without a comparable level of transit coverage, Busan struggles to offer the same degree of accessibility that has made the Seoul area resilient to population shifts.

Population Loss and Industrial Strain

Population decline and aging have become the defining pressures on Busan, Ulsan, and South Gyeongsang. Busan’s population fell to 3.25 million in 2023, allowing Gyeongnam to overtake it for the first time in modern history. The city’s annual decrease of more than 20,000 people is accompanied by one of the fastest aging trends in the country: over 22 percent of residents are now 65 or older. Ulsan, once buoyed by shipbuilding and petrochemicals, has lost nearly 100,000 residents since its 2015 peak as heavy industries contracted. Gyeongnam is on a gentler trajectory but faces the same combination of low fertility and out-migration.

These demographic shifts are reshaping the geography of the cities themselves. In Busan, the new high-rise districts in Yeonje and Haeundae continue to attract households, while older university-centered neighborhoods like Geumjeong are losing thousands of residents annually. Ulsan’s southern core has thinned, with growth shifting to peripheral districts. In Gyeongnam, older centers such as Masan have declined, while state-backed developments in Changwon and Jinju absorb what limited inflows remain.

Industrial erosion compounds the problem. Ulsan’s global shipyards and automotive plants no longer guarantee stable employment, leaving younger workers to seek opportunities in Seoul or abroad. Busan’s port still anchors the regional economy, but the city has struggled to build new high-value industries beyond logistics and tourism. In Gyeongnam, machinery and manufacturing clusters remain significant but face global competition and automation-driven downsizing. The result is a narrowing pool of quality jobs, exactly when the region needs them to retain a shrinking cohort of young people.

The combined effect is a structural imbalance: fewer young residents, more elderly dependents, and weaker industrial bases. This context matters because no transport network, however efficient, can reverse these forces on its own. Rail links may shorten commutes, but they do not create new industries or replenish the student bodies of regional universities. Without targeted interventions in employment, education, and housing, the demographic and economic headwinds facing the BUG region will continue to outweigh the benefits of faster trains.

Empty Classrooms, Departing Youth

Universities in Busan, Ulsan, and South Gyeongsang are facing an accelerating enrollment crisis. Education ministry data show that in 2022, more than 40 regional universities across the country failed to fill even 80 percent of their freshman quota, a threshold widely regarded as unsustainable for normal operations. Institutions in the BUG region are no exception: several private universities reported chronic shortfalls despite offering tuition discounts and scholarships designed to attract applicants.

The demographic backdrop is stark. The number of 18-year-olds nationwide fell from over 800,000 in the early 1990s to around 430,000 in 2023, and projections suggest continued decline. While metropolitan universities continue to draw applicants through prestige and perceived opportunity, local campuses face empty lecture halls. The imbalance is reinforced by employment patterns: high-value jobs remain concentrated in Seoul, giving families a strong incentive to direct their children north.

Transport improvements have done little to alter these dynamics. High-speed rail links may shorten travel times between Busan and Ulsan, but they do not reduce the perceived gap in opportunity between a Seoul-based degree and a local one. The example of KTX connections in other provinces demonstrates the point: easier access to the capital often intensifies outflow, enabling students and young workers to leave more easily rather than encouraging them to stay.

This creates a structural limit to what rail investment can achieve. Even if commuting between BUG cities becomes more convenient, the central challenge remains the shrinking and aging student base and the lack of high-quality employment that would anchor young people locally. Unless university reform, research investment, and job creation are pursued in parallel, mobility gains risk serving as one-way exits rather than tools of regional regeneration.

Steel Tracks as Political Currency

Large-scale rail projects in Korea have consistently intersected with election politics, and the BUG region is no exception. Both national and local candidates have positioned new lines as tangible proof of commitment to balanced development. Campaign pledges frequently highlight promises to accelerate feasibility studies, bypass regulatory hurdles, or extend lines to specific districts. The timing is rarely coincidental: announcements often cluster around general elections, when infrastructure commitments carry clear electoral weight.

In practice, these pledges often serve more as political signals than as implementable policy. The record shows a pattern of projects being promised, delayed, and reannounced. The GTX program in the capital area illustrates this cycle: first proposed in the early 2000s, it was recycled in multiple election campaigns before construction began nearly two decades later. In the BUG region, candidates across parties have similarly used the idea of a metropolitan express rail link as shorthand for regional revitalization, even when the financial and technical feasibility remained unresolved.

This dynamic creates two risks. First, infrastructure is framed as an electoral prize rather than as part of a coherent long-term strategy, encouraging competition between municipalities for stations and routes rather than cooperation across the region. Second, public expectations are repeatedly raised and then frustrated, eroding trust in both political leaders and planning institutions. In Busan, Ulsan, and Gyeongnam, civic groups have pointed to this cycle as evidence that “balanced development” is more often deployed as campaign rhetoric than as policy grounded in sustainable resources and priorities.

The persistence of this pattern highlights a broader governance challenge: without mechanisms to insulate transport planning from electoral cycles, regional infrastructure debates risk being dominated by short-term political incentives rather than long-term economic or demographic needs.

The Myth of Rail as Regional Salvation

South Korea’s policy frameworks have often equated large-scale transport investment with balanced development. The assumption is straightforward: if regions are more accessible, people and businesses will settle more evenly across the country. The experience of both the capital area and provincial regions shows that this link is neither automatic nor consistent.

In the Seoul metropolitan area, the GTX network expanded commuting options but reinforced Seoul’s primacy as the ultimate destination for work and education. In provincial regions, the arrival of high-speed rail improved mobility but frequently redirected flows toward the capital rather than sustaining local economies. This pattern indicates that transport is a facilitator, not a determinant, of development trajectories.

For the Busan–Ulsan–Gyeongnam region, the lesson is clear: new rail lines will not by themselves reverse population decline, industrial contraction, or university shrinkage. Unless transport is integrated with broader measures—such as incentives for firms to locate outside the capital, investment in higher education quality, and targeted industrial diversification—the result may be limited to property speculation around stations and faster out-migration of youth.

Policy evaluation tools also need recalibration. Current feasibility assessments emphasize ridership and cost-benefit ratios, which favor dense capital-area projects. A stronger weighting of long-term regional equity and demographic sustainability would shift investment logic toward places like Busan, Ulsan, and Gyeongnam. Without this correction, transport policy risks deepening rather than correcting national imbalances.

Balanced development, therefore, cannot be achieved through rail projects in isolation. It requires a package approach: transport as connective tissue, combined with deliberate policies for jobs, education, housing, and cultural vitality. Only in that context can the new lines in the southeast function as more than high-cost infrastructure and instead as part of a viable regional renewal strategy.

Concrete Alone Cannot Carry Balance

The expansion of rail in the Busan–Ulsan–Gyeongnam region illustrates both the promise and the limits of infrastructure-led policy. Faster trains will reduce travel times, improve commuting options, and connect fragmented corridors into a more coherent network. These are tangible gains for residents who have long faced inadequate links compared with the capital.

But the broader expectation—that rail alone can reverse demographic decline, sustain universities, or generate jobs—rests on weak ground. The trajectory of the GTX in the Seoul metropolitan area, as well as population and industry trends in the south, show that transport infrastructure tends to amplify existing dynamics rather than transform them. Without complementary measures in employment, education, and housing, new lines risk becoming conduits for out-migration or triggers for property speculation rather than instruments of renewal.

For policymakers, the lesson is straightforward. Rail should be treated as an enabling platform, not as a cure-all. The critical challenge is to align infrastructure with policies that anchor young people, diversify industry, and rebuild the social base of cities under demographic stress. If those links are made, the new railways could become more than faster commutes; they could form part of a durable strategy for regional survival. If not, they may stand as another reminder that concrete and steel, by themselves, cannot carry the weight of balanced development.