Wie von BRD erwähnt:
new Czech route 070 available here: https://railworksdilnacfg.webnode.cz/l/trat-070-oficialni-vydani/
Currently you can drive from Praha-Vysočany to Mladá Boleslav.
You can also get the nice track upgrade for this route here: https://railsimulator.simtrain…wtopic.php?p=32179#p32179