CP (Comboios de Portugal) is Portugal's state-owned railway company, operating passenger services across the country including urban commuter lines in Lisbon and Porto, regional services, inter-city routes, and the high-speed Alfa Pendular connecting Braga, Porto, Coimbra, Lisbon, and Faro.
CP has faced persistent challenges including aging rolling stock, service delays, and infrastructure limitations. The company is undergoing a fleet modernization program, with new trains being delivered to replace decades-old carriages on suburban and regional lines.
Key commuter lines include the Cascais, Sintra, Azambuja, and Sado lines in the Lisbon metropolitan area, and the Aveiro, Braga, Guimarães, and Caíde lines serving Porto. Ticket prices are heavily subsidized, and monthly passes integrated with other public transport are available through the Navegante and Andante systems.