Lisbon tram schedules

The trams must be running different routes crossing over at certain stations, you will frequently see two trams pull into a station directly aligned, sometimes the opposing track will have two trams ensuring a busy station.

You will frequently see trams following each other around on some sections of the same track before they part company and head their seperate ways. I was interested in how many people they had squeezed into the carriages at times, this is a well used system.