在官方討論串當中
除了上面的文章之外，官方有再補充幾個訊息
1.
Tram bridges and tunnels, I forgot to mention those! Yes, the tracks work
with the same basic logic as roads, so you can elevated them or dig tunnels.
電車軌道一樣可以搭橋和挖隧道，建造的邏輯跟一般道路一樣
可以抬升或潛遁
2.
Trams are mechanically closer to buses, but have the added benefit of being
able to avoid roads with the standalone tracks. They are best for short inner
city lines, as the average speed of a tram is very low compared to a metro.
Metros are meant for longer distances and building tiny little metro lines
would cost an insane amount, so trams are the thing you want to use when you
need a public transport type that can be free of roads but work for small
areas.
關於電車和地鐵的不同，官方的回答是
地鐵使用在較長的距離，軌道的面積也較小，但也比較花錢
電車則是使用在小區域當中，同時不用太特地改變原有的道路規劃