After some time of doing of nothing, I began to work on new tram tracks.
Full set will contain (but at first without winter versions):
Ground tracks for speeds:
50 km/h
75 km/h
100 km/h
Underground tracks/bridges for speeds:
75 km/h (length of bridge max. 2, 4)
100 km/h (length of bridge max. 2, 4)
I thought about making also elevated track (probably it would be only for speed 100 km/h) - but there I have not idea for shape of construction that will carry the track.
I got idea for creation of tunnel for trams some time ago, probably in time when I played pak128 - because laying tram track in road tunnel gives very strange results.
But few months ago, when I wanted to build tram track not along roads (as I build it often), but through city, with crossing many roads, I found that tram tunnel would be really needed and useful.
And by the way, I don't think about underground tram as of variation of metro where trains go in underground in some parts of route - and somewhere on ground. I think about common tunnel to cross short hill inside city.

Tunnel between two tram stations in Prague tram site (Chaplinovo náměstí, Poliklinika Barrandov).
So, switches will be graphically ready (for later purposes) - but they will not be included in dat file.
And may it be (and it is almost sure) that I will add (into already prepared wires) also rest of switches - but these switches will not be included in dat file.
All three tracks will be ready for half-height, for later purposes.