I just played a train from timetable called "TDE 412042", and I just loved the experience.
The challenge of handling quick changes of speed (for example to 20km/h crossings) in SHP, then switching through two ETCS modes around Sprowa, then getting caught by faster trains after Psary. At this point I was checking the timetable, and asking myself "what is next?"... and saw that this train ACTUALLY has a end stop at Lódz!
But no! The track is not built yet!
At Idzikowice the mission ends, and that made me "sad" 😉
So I started checking the map more closely and got surpriced:
There are "only" about 7-8 stations needed to reach Mikolajow, and then Zakowice Poludnowe.
My suggestion is simply:
How about connecting Idzikowice with the Lodz-DLC lines?
Either as a "mini-DLC", or maybe a longer version all the way to Radom (making it a full DLC for Radom)
Personally I like having a "mesh" of lines, rather than long stretches, which this suggestion gives in the "north".
But in this case Tomaszow seem to look like a fun challenge in itself, with some "tight turns" and a "city to pass"
Also not sure how big of a development team this is, but I would gladly sponsor some extra money to make it happen.
(or to make an editor happen, which seem not ready yet)