Some useful tips:
1.Trams go one way only on one tile. If you want 2 or more trams on a line, try to put tram tracks on to city roads.
2.You must electrify your line unless you are using horse trams or playing pak contrast.
3.Trams can run on electrified railway. In pak192 comic, trams run on narrow gauge railway. In other paksets, trams run on normal railway. In Simutrans Extended, you can only place tram tracks on roads, on clear land you should use railway track.
4.Trams can use both railway stations or bus stops. In 128px paksets, you cannot find stops in tram tools. You can find them in railway tools and road tools. Trams on roads can use railway station!
5.In pak256 and pak contrast, tram tracks and depots are in the railway tools. If you want to build bridges and tunnels for trams, use railway tunnels or build tram tracks on road bridges.