The Z1 pack contains 4 different trams in any livery, animated cab crew, animated doors and windows, including 12 months warranty, all updates and fixes for $10 US. You may specify numbers/routes although 10 popular route names/numbers are provided and are user selectable in Surveyor. Full weathering add $1 per tram. Individual trams available for $5 each.
The green/yellow version shown here also may have the brown/white or grey livery. The models include accurate 3D modelling of external features such as power off handles, window chrome parts, textures etc. An animated driver is included in the trams. Nightime mode with lights, blinkers and interior lighting is included. Passenger enabling for 40 passengers is included with opening doors and windows.
Full history and a few pics here|