Most transit debates obsess over capacity or speed, but Sam Denby flips the script by arguing that for cities like La Paz, the real victory is simply getting people moving at all. In a world where metro projects stall for decades, Denby presents a case study where a ski-resort technology solved a canyon-city's decades-long paralysis, proving that the right tool for the job isn't always the most glamorous one.
The Geography of Desperation
Denby opens by dismantling the assumption that only massive, wealthy capitals deserve robust transit. He notes that while La Paz is "fairly humble" in population and output, it possesses a "robust, interconnected, reliable urban transit system" that its larger neighbors lack. The author's framing is sharp: this isn't about prestige; it's about survival in a city where the wealthy live in the canyon and the working class is stranded on the plateau above.
The core of Denby's argument rests on the city's brutal topography. He explains that the city spans elevations from 9,000 to 12,000 feet, creating a situation where "climbing such a steep grade is a unique problem for a traditional transit system, but it's one well within the comfort zone of the technology that specializes in similar terrain." By reframing gondolas not as a gimmick but as an engineering solution to a specific geographic constraint, Denby makes a compelling case for context-specific infrastructure.
"The core of the logic behind La Paz's gondola system is that it solves the city's fundamental geography problem."
This logic holds up under scrutiny. Traditional buses get stuck in the same gridlock as private cars, and trains require expensive tunneling or massive road cuts. Denby highlights that the gondola system, known as Mi Teleférico, bypasses these issues entirely by floating above the congestion. The author points out that the system has grown from three lines to ten, servicing 520 million passengers in a decade, proving that the "unconventional system has worked out."
The Economics of Speed
Denby doesn't shy away from the limitations of cable cars. He admits they are "worse in just about every way but cost" compared to trains, citing fixed capacity and the inability to add more cars during rush hour. However, he pivots quickly to the financial reality of developing nations. The argument here is that cost and speed of deployment matter more than theoretical maximum capacity when a city is already paralyzed by traffic.
He contrasts the gondola's $23 million per kilometer price tag against the prohibitive costs of metros in neighboring cities. Denby writes, "Establishing some sort of public transit system has been a point of discussion in Bolivia's capital since the 1970s," yet nothing happened until the economics aligned. The administration under Evo Morales recognized that a project could be "innovative, putting Bolivia on the map" while being "the most expedient option."
"By floating over the city rather than reshaping it, La Paz avoided radical road reconstruction and minimized property purchases, saving the government millions of dollars and years in construction."
This is the piece's strongest economic insight. In many urban planning circles, the focus is on long-term capacity, but Denby correctly identifies that a system that takes 15 years to build is useless to a city in crisis. The ability to go from approval to operation in just two years is a game-changer. A counterargument worth considering is whether this speed comes at the cost of future-proofing; as cities grow, can a fixed-capacity cable system scale fast enough, or will it eventually become a bottleneck? Denby acknowledges the capacity limits but suggests that for the immediate needs of the working class, the trade-off is worth it.
Beyond the Andes
The commentary expands to show that this isn't just a Bolivian anomaly. Denby traces the lineage of urban cable cars to Medellín, Colombia, noting that the model is spreading "like wildfire" across Latin America because these cities share a specific set of conditions: mountainous terrain, rapid informal growth, and limited capital for grand infrastructure projects.
"A confluence of factors make Latin American cities uniquely suited for gondola public transit."
Denby then tests the theory against a non-Latin American example: Brest, France. Here, the geography wasn't a mountain but a river with a naval base, making a bridge too expensive and complex. The cable car became the logical bridge, costing a fraction of a traditional span. This broadens the scope of the argument, suggesting that the technology's utility extends beyond just steep hills to any "geographic impediment that makes buses slower or trains impractical."
"The impact of such a change is hard to overstate as it's proved nothing short of life-altering for many."
This emotional weight is crucial. Denby moves beyond the spreadsheets to describe the human element: a commute shrinking from 40 minutes of stress to 10 minutes of reliability. He notes that students can study more, and workers have more energy, creating a net economic benefit that outweighs the fare. The system has effectively bridged the economic and ethnic divide between the two cities, turning a physical barrier into a connector.
Bottom Line
Sam Denby's analysis succeeds by stripping away the bias that favors heavy rail and exposing the pragmatic brilliance of the gondola for specific urban contexts. The strongest part of the argument is the demonstration that infrastructure success is defined by utility and speed of delivery, not just capacity. The biggest vulnerability remains the fixed capacity ceiling, which could become a critical failure point if the city's population continues to surge beyond the system's design limits. Readers should watch to see if other cities with similar constraints adopt this model, or if the "gondola boom" remains a uniquely Latin American phenomenon.