The train service from Santa Comba Dao to Guarda is primarily operated by Comboios de Portugal (CP), utilizing the Alfa Pendular and Intercidades trains. The Alfa Pendular service is the faster option, reaching speeds of up to 220 km/h (137 mph), and typically completes the journey in approximately 2 hours. This train provides a comfortable seating arrangement and onboard services such as Wi-Fi and refreshments. The Intercidades service also operates on this route but takes a bit longer, around 2 hours and 30 minutes, making more stops, which can include stations like Viseu and Celorico da Beira.
Travelers have the option to choose between First Class and Second Class seats, with First Class offering additional comfort and amenities. While both services are well-equipped, the Alfa Pendular is recommended for those prioritizing speed, whereas Intercidades allows for a more leisurely travel experience with additional regional stops.