golden. The project was assigned to Proyecto Metro, which was headed by Enrique Horcasitas. The announced stations from west to east, with their original names, were: Mixcoac, Insurgentes Sur, 20 de Noviembre (later renamed to Hospital 20 de Noviembre), Zapata, Parque de los Venados, Eje Central (otherwise known as Popocatépetl), Ermita, Sur 69, Vía Láctea, Mexicaltzingo, Francisco del Paso, Ganaderos (otherwise known as Granaderos), Canal Nacional, ESIME Culhuacán, La Vírgen, Calle 11, Periférico Oriente, Tezonco (also known as San Lorenzo), Olivos (also known as Los Olivos), Francisco Villa (later renamed to Nopalera), Zapotitlán, Tlaltenco and Tláhuac. All but the last three were planned as underground stations. Construction Due to budget, time, and other setbacks, the line underwent several modifications. For instance, Sur 69 and Vía Láctea stations were not built due to neighborhood opposition. Ganaderos station was rejected by the National Institute of Anthropology and History because its construction would have affected a nearby archaeological site. Francisco del Paso station was canceled because its construction would have caused a six-month partial closure of Line 8; instead Atlalilco station was chosen as the interchange station and as a consequence it has the longest passenger transfer tunnel in the system. These issues caused the route to be changed. Instead of running along Arneses Avenue (Eje 3 Oriente) and later along Canal Nacional Avenue, the route was moved instead to run along Tláhuac Avenue (Ejes 9 and 10 Sur). ESIME Culhuacán and La Vírgen stations were relocated and became San Andrés Tomatlán and Lomas Estrella stations, respectively. Between Atlalilco and San Andrés Tomatlán, Culhuacán station was added to the route. Construction of the first leg of the line, Tláhuac–Atlalilco, started on 23 September 2008. The section was replanned as an at-grade route to be later modified to a combined at-grade and elevated section. The second stretch of the line, which runs underground from Atlalilco to Mixcoac, was finished in April 2012. The line was built by a consortium comprised by ICA Group, Carso and Alstom. The project suffered multiple construction delays, and its $1.3 billion cost was a 50% overrun. Inauguration Starting on 16 June 2012, the STC allowed riders to have access on Sundays to test the service and to familiarize them with the stations and route. The line began daily service on Monday 24 September 2012, and it was officially inaugurated on 30 October 2012 by Marcelo Ebrard, Head of Government