A subsequent investigation blamed flawed signaling equipment for the crash. China had been operating high-speed trains at 350 kilometers an hour (about 218 m.ph.), and it cut the top speed to the current rate in response to that crash.

The crash crystallized worries about the haste with which China has built its high-speed rail system. The first line, from Beijing to Tianjin, opened a week before the 2008 Olympics; a little more than four years later, the country now has 9,349 kilometers, or 5,809 miles, of high-speed lines.

China’s aviation system has a good international reputation for safety, and its occasional deadly crashes have not attracted nearly as much attention. Transportation safety experts attribute the public’s fascination with the Wenzhou crash partly to the novelty of the system and partly to a distrust among many Chinese of what is perceived as a homegrown technology, in contrast with the Boeing and Airbus jets flown by Chinese airlines.

Japanese rail executives have complained, however, that the Chinese technology is mostly copied from them, an accusation that Chinese rail executives have strenuously denied.

The main alternative to trains for most Chinese lies in the country’s roads, which have a grim reputation by international standards. Periodic crashes of intercity buses kill dozens of people at a time, while crashes of private cars are frequent in a country where four-fifths of new cars are sold to first-time buyers, often with scant driving experience.

Flights between Beijing and Guangzhou take about three hours and 15 minutes. But air travelers in China need to arrive at least an hour before a flight, compared with 20 minutes for high-speed trains, and the airports tend to be farther from the centers of cities than the high-speed train stations.

Land acquisition is the toughest part of building high-speed rail lines in the West, because the tracks need to be almost perfectly straight, and it has been an issue in China as well. Although local and provincial governments have forced owners to sell land for the tracks themselves, there have been disputes over suddenly valuable land near rail stations, with the result that surprisingly few stores and other commercial venues have sprung up around some high-speed stations used by tens of thousands of travelers every day.