I tested one of the Niddertalbahn 2019 built-in sessions last night on this lovely route. It ran well and was very smooth at the highest performance settings even with 15000m draw distance.
The landscape and scenery are great (though I'd like to see the 2D vegetation/ grasses replaced entirely on ANY TRS2019 route, where practical).
Yes, the cab interiors on the included locomotives could be updated, but the chances of me re-running these built-in sessions in the future are low - I prefer instead to create my own sessions based on these included routes, so I get to choose the consists and their destinations, asset quality, tasks etc.
Thought that the bi-lingual passenger announcements triggered during gameplay were a great feature of this session.