I'm happy to see that older preserved routes aren't just been abandoned and DTG is publishing new loco DLC for them, and there's now the preserved crew dedicated to improving them. The improvement I would most like to see on these routes is to add more gameplay (i.e. layers) when a new relevant loco is added (either via a new route or new loco DLC). As an example the 403 was added in HMA, which also serves HRR and RRO. Going back and adding a new layer to the timetable with ICE services would really increase the value of the newer HMA DLC as it would add more gameplay to some of the routes I already have. And yes you can sort-of manually do this already with scenario planner (and I have), but with the tool available you just can't achieve the same level of quality as the devs can through the timetable.