OHL Construcción is the construction unit of Spanish multinational group Obrascón Huarte Lain S.A. (OHL) and it is involved in the development of railroads, hospitals, highways and ports. In Latin America, the company has built hospitals in Panama, Costa Rica, Mexico, Argentina, Ecuador, Uruguay, Venezuela and Chile. Some of its major projects are the 4.3km tramway system for the city of Medellín, Colombia. The project included 12 cars, as well as nine ground-level stations. The system has an installed capacity to transport 90,000 passengers a day. It also built the 144km Río Magdalena highway, in northeastern Antioquia department. In Mexico, the firm built the 32km Viaducto Bicentenario elevated highway in the Valley of Mexico, which is operated by Viaducto Bicentenario, S.A. de C.V. a subsidiary of OHL's concessions division, as well as the 155km Circuito Exterior Mexiquense highway, across 18 municipalities in northern and eastern Mexico state. In Peru, the firm developed the 170km Red Vial Nº4 highway. OHL Construcción is headquartered in Madrid.