Good work PietLu, especially for a first attempt! :D (It taxes you a bit harder if you don't reverse trains, but there are a few ways to complete it even then!)

98% at first try without save scrum or resetting, but with reversing some trains.
Awesome map - must have been hard to create that timetable x)

SteR. Thank you for your feedback, I have modified the screenshots to the game default, track map layout, no trains and no colours accordingly.

Do you really need to add screenshots with the color mod active to your level thumbnails? It just makes the already cluttered and hard-to-follow track layouts harder to look at by adding even more visual clutter/distractions. Plus, the mod isn't available on Steam - it's only on the community discord.
Personally, I would stick to the vanilla screenshots that can be made in the editor. This just looks way too messy.