Travelers on the Viana do Castelo to Espinho route primarily use the Intercity and Regional train services operated by Comboios de Portugal (CP). The Intercity service is known for its speed, reaching up to 160 km/h (99 mph), and makes the journey in approximately 1 hour and 45 minutes, with fewer stops compared to the Regional service. The Intercity trains offer comfortable seating and amenities such as air conditioning and dining options. On the other hand, the Regional trains, while slower at up to 90 km/h (56 mph), take about 2 hours and 30 minutes, making more stops at local stations which can be beneficial for travelers wanting to explore small towns along the way. Both types of service provide a scenic view of the beautiful coastal areas of Portugal, with the Intercity option being more suitable for those prioritizing speed and efficiency.