Throughout Latin America, infrastructure lags much of the world

The Transnordestina railway is supposed to carry soybeans, iron ore and other commodities from farms and mines in northeast Brazil to ports in Ceará and Pernambuco, and then on to markets in China. Brazil has spent more than $1.8 billion on the project since work began a decade ago. But cows still amble along its unfinished tracks.

In Lima, Peru, and Bogotá, Colombia, workers can spend half as much time commuting as they do at the office. In Brito, a village on Nicaragua's Pacific coast, there are no paved roads, electricity or running water. "It's like we're still living in the era of Columbus," laments a fisherman.

Latin America is hobbled by its inadequate infrastructure. More than 60 percent of the region's roads are unpaved, compared with 46 percent in emerging economies in Asia and 17 percent in Europe. Two-thirds of sewage is untreated.

Poor sanitation and lack of clean water are the second-biggest killer of children under 5 years old, according to the World Health Organization. Losses of electricity from transmission and distribution networks are among the highest in the world. Latin America spends a smaller share of GDP on infrastructure than any other region except sub-Saharan Africa.

There are some bright spots. Chile's roads are better than those of Belgium, New Zealand and China, according to the World Economic Forum. Uruguay's electricity and telecoms outclass those in the United States and Canada. But in general, the quality of infrastructure is more of a drag on than a boost to Latin American economies.

Recently a window of opportunity to upgrade it opened up. Global interest rates have been unusually low, which makes it cheap to raise money to repair old infrastructure or start new projects. Market-friendly presidents have taken office in several countries, including Brazil, Argentina and Peru. They have made improving infrastructure a priority.

Pedro Pablo Kuczynski, Peru's president since July 2016, promised to turn the country into a "construction camp." Mauricio Macri, elected Argentina's president in 2015, launched an infrastructure plan called Plan Belgrano for the country's poorly connected north. His cabinet chief, Marcos Peña, calls it "the most ambitious in Argentina's history." In Colombia a promise to build rural infrastructure is part of the peace agreement between the government and the FARC, a leftist guerrilla group that had been at war with the state since 1964.

Governments also worry that a rise in interest rates will raise the cost of borrowing to build infrastructure and that a reduction in corporate tax in the United States, signed into law by Donald Trump in December, will pull capital away from Latin America. They are racing to get their infrastructure plans back on track before the opportunity passes.

The biggest need, said economists, is for roads, railways, ports and urban transport to speed exports and the travels of workers.

A big difficulty in widening such bottlenecks is cumbersome procedures, legal hurdles and ponderous bureaucracies. A new airport near Cusco, Peru's most popular tourist destination, was proposed in the 1970s; a contract to build it was signed in 2014 but scrapped last year.

Not all the news is bad, however. One reason for cheer is that infrastructure can be less expensive than governments think. With conventional policies, South America needs to spend at least $23 billion a year to upgrade its electricity networks, according to the World Bank.

But if the region manages demand better, introduces renewable sources of energy and promotes conservation, it can cut that cost to $8 billion to 9 billion.