The train station of San Bento was built in the early 9th century on the ruins of the former convent of San Bento's Ave Maria. Although the entrance of its facade is stately and old, the true gem can be found on its inside: A hall decorated with more than 20,000 pieces of mosaic that reiterates the history of Portugal.
The tram (or the electric) is actually more than just a means of transportation, it's also a tourist attraction, due to the growing popularity of the metro and other high-speed, modern transportation. Only about a half dozen trams operate on four lines, but the tram system is not without its own charm when you're taking a ride in one of these old "electric cars" in the middle of the city. You can visit the [poi = 70777] Electric Trolley Museum [/ poi], which allows you to get up close and personal with several refurbished electric cars. There is also a modern subway line that runs through the upper Luis I Bridge to Porto that connects with [poi = 72079] Vila Nova de Gaia [/ poi], on the other side of the Duero.
Oporto has has a metro since 2003 and currently there are 5 lines with 2 more are under construction. It uses the Andante card with an embedded computer chip, thus Porto is the first city to use public transport with low cost, contactless tickets. So, the user keeps the card (in their purse or wallet) only having to pass through the scanner to validate the trip. I took the Metro from Porto Airport to the train station and a very nice subway worker helped me buy the ticket and explained how to use it. I found no problems.
The train station in Viana city center is next to the giant Estação Viana Shopping Centre and was built in the late nineteenth century, by project engineer Alfredo Soares who combined traditional elements (wood, granite and tiles) with industrial materials (iron). It's unique in that there is a closed transit platform, which is, permanently, an old metal train that's very curious. Near the entrance to the platforms there's a lift to the top of the pedestrian bridge that crosses the tracks, at the end of which is the foot of the funicular of Santa Luzia.
Guimarães train station is on the southern approach to the city (from the highway A-11, A-7/A-24 and N-106), on João IV Avenue in front of Hotel Boss. It's a modern building (with the appearance of being new) although not very large, there are lockers for ticket sales, a waiting room, a coffee bar, two platforms and an outdoor car park. Guimarães is the last station, it's the end of the line for Alpha Pendular, Intercity and regional trains.