The tracks along Nicholson St were re-laid last year at a slightly elevated level from before to provide increased separation from the rest of the road traffic along Nicholson St. These tracks now sit at curb height rather than road height.
The depot entrance tracks are still there but disconnected and now at a different level to the mainline. I suspect the next time Nicholson St is due for a resurfacing, these tracks will be abolished.
According to Vicsig there are trams inside
That doesn't mean there are still trams on site at North Fitzroy. Vicsig can be a bit out of date in some regards, I take what I read there with a grain of salt.
There may still be trams there, but I'm not too sure. Some of the trams that were previously stored there (including an Adelaide H type tram and a former W class restaurant tram among others) were moved out to Preston Workshops years ago, but that doesn't mean some weren't left behind.
I've heard a Grey Lines driver-guide mentioning that anything older than 100 years will be heritage-listed even if it's just a public toilet
Codswallop. Just because something is old, that doesn't automatically qualify it for heritage status. It requires some form of significance (even a toilet block can qualify as significant). Is North Fitzroy Tram Depot significant in some way? Not for me to say, but it won't qualify on age alone.
Why would anyone disconnect tracks to a tram depot with trams in the depot? Must be a Victorian thing.
I believe the last time a tram entered North Fitzroy was in November 2010 when a pair of defective C2 class (Bumblebee) trams were shunted into there to get them out of the way of the afternoon peak hour. No tram has entered the North Fitzroy depot since. I can only assume Yarra Trams have since declared the forward facing points were too much of a risk (risk of derailment, wrong routing incident or other similar mishap) for too little reward.