>>939652humm.
back to the tram topic, it seems like the only tram network exist here which was created back into pre-WWI time is now dated despite there're continuously new trams and upgrade. The current tram system here have a minimum curve radius of 2m, vehicle width is also limited to be <2m by law as well as track and road wodth, and as a double decker it have high gravitational center which all these limited its speed and thus competitiveness of the tram network, making it inferior to bus.
Another factor limiting the tram's development is that being a century-old transportation it can be seen as a kind of heritage and thus making innovation on the tram unwanted, for instance when the tram company use some aluminum tram to replace wooden tram or when they add air conditioned tram into the system, people would object to the plan.
With the aforementioned situation and competition from parallel metro lines and bus lines, the system see a decrease in its ridership despite still fully packed with passenger in peak hour. Because of the speed factor, most riders would only use it as a short distance travelling tool.
On the other hand, there's no trolley bus system here, government once asked bus companies to research about it but they said the cost to establish cables and such would make the cost increase by 80%-210% and would result in 20%-70% price increase despite its ability to cut pollution, so no further research exist.