One of the most widely known icons of Lisbon is without a doubt the “famous” Tram 28. While visiting Lisbon it is often common among visitors to try a ride aboard it. Visitors arrive to the city willing to ride Tram 28 and, the two main reasons are it figures in many tourist publications and it is cheap to ride.
Start your trip early in the morning, before 09:00 am, or in the evening, after 09:00 pm, as the tram will be way less crowded and the waiting line is short;
Try to grab a seat, otherwise you will not see much of the city. Standing up won't be as comfortable and you will be more exposed to thieves, specially when the tram is very crowded;
If you realize the tram is full when you’re climbing aboard, consider waiting for the next one.
Always when you see a large queue, consider instead going on a Walking Tour. It's a great way to see old town Lisbon properly and without waiting.