There is also a real tram depot. I just had time to take this picture (1/25th of a second...) before I was kicked out of there.
It was not a public place but the way I was told... Fortunately, I don't speak Chinese, but the man was more than angry or furious...
So there is a third running tram, and a fourth was under construction on the right. On the left is a horse tram.
Furthermore, in another hangar there is another tram, but with tyres...