Thats a lot better than the current one but I think it's still too detailed for the side map. It's closer to what I use as the system map. This is more what I had in mind for the Dart carriages only less ugly and with the other stations named as well
2900s would have a similar map for the Sligo/Maynooth route.
Edit: Comcor's map is what I would have drawn if I had any skills. Simple, easy to read only shows one route with interchanges.