The route from Santarem to Viana do Castelo is primarily served by the Intercity (IC) and Regional (R) trains. The Intercity train provides a faster option, reaching speeds of up to 160 km/h (99 mph) and takes approximately 2 hours and 30 minutes for the journey. This train typically makes fewer stops, allowing for a more direct travel experience. In contrast, the Regional train operates at lower speeds, around 90 km/h (56 mph), and the travel time can extend to over 3 hours given its additional stops throughout the route.
The Intercity service features comfortable seating and facilities suitable for both short and long-distance travel, while the Regional train caters more to local travelers with its stops at smaller stations. For passengers prioritizing speed and fewer interruptions, the Intercity train is the optimal choice, whereas the Regional train offers broader accessibility across various towns.