For International travel or just long distance travelling in Porto, the trains are perhaps the most a convenient mode of transportation in Porto.  

Porto Trains run to many different national and international destinations. The railway's website is very useful and can give you all the information you need. If it happens to pop back into Portuguese, just click the little square image at the top right side of the page.

For the train system click here 

Tel: 808-208-208 (7:00-23:00)