Claudia Sheinbaum, Head of Government of Mexico City, and Guillermo Calderón, director of the Metro Collective Transport System (STC) announced the modernization program for Line 1, which includes the purchase of 29 new trains, which are already being manufactured in China by cutting-edge companies.In 2020 it was learned that the Chinese company CRRC Zhuzhou Locomotive, a subsidiary of China Railways, won the contract for 1.6 billion dollars for the renovation work on line 1 of the capital's metro, beating the Spanish Construcciones y Auxiliar de Ferrocarriles (CAF). ), which finally had to withdraw in the final stage of the tender on the grounds that reducing costs so much could imply risks in the quality of services.Thus, CRRC Zhuzhou Locomotive and CRR Hong Kong Company, subsidiaries of the largest Chinese construction company of trains and railways, obtained a contract for more than 37 billion pesos, to be paid in 19 years.In addition to the new trains, it will be in charge of carrying out the rehabilitation work on the line and the installation of a new electrical system and automatic piloting.CRRC, the company that won the CDMX Metro contract, was involved in a controversy in 2014 with the administration of Enrique Peña Nieto over the cancellation of the Mexico-Querétaro Train, due to an alleged connection between that Chinese company and the Higa Group, a company that he would have sold the "White House" to the wife of the then President of the Republic.In November 2019, then-US President Donald Trump issued an executive order banning US investment in 31 Chinese companies suspected of being controlled by the Chinese military.That list included CRRC Corporation Limited, the largest train builder, which according to the Pentagon is one of the firms with which China's military apparatus is financed.But not only Donald Trump applied sanctions on this company, his predecessor, Barack Obama, also implemented some actions upon seeing his aggressive advance in Latin America, where he offered several countries to finance infrastructure projects.One of them was in Nicaragua, where the Chinese company intended to open a waterway to compete with the Panama Canal, however, in 2016 the project was suspended.According to the CRRC ZELC company, its business is focused on electric locomotives, urban rail vehicles, battery electric locomotives, magnetic levitation trains, electric trams, spare parts and general electromechanical services contracting services.He points out that it has 21 subsidiaries that are distributed in China and other countries.In his column of November 20, 2020, Raymundo Riva Palacio explained that before the US Congress, the Alliance for Railroad Safety of the North American country denounced that this Chinese company applies unfair tactics to win low-cost contracts.“Among the practices that make it easier for them to lower their costs, the vice president of the lobbying group, Erik Olson, said at a congressional hearing last September, are labor violations that have allowed the “exploitation” of children and minorities in China. ”, explained the journalist.Calderón, director of the Metro, indicated that with almost 53 years of service, the useful life of the systems that allow the operation of Line 1 has been exceeded, so the closure of almost a year is necessary and modernization is essential."There are 29 new high-tech trains, very modern and professionally designed and manufactured for Mexico City," said the director, who said that these will have a 35% greater capacity.He said that the new cars will be connected by a single aisle: "It has the great advantage that it allows ventilation inside the train in addition to the quality of travel."He said that although the trains will be manufactured in China, they will be assembled in Mexico by 120 Mexican technicians and the first of them will arrive in September, which will be called "head of series."This Chinese company participates in railway projects in Latin American countries such as Colombia in the so-called Ruta de la Leche, line F of the Buenos Aires Metro in Argentina, route 68 in Valparaiso in Chile, in addition to participating in the Quito metro, Ecuador, and São Paulo, in Brazil.