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Notes

I’ve been building Paiagram since November 2025, but the idea of building a Marey chart editor had sticked in my head for a much longer time. I have tried drawing my own Marey charts since grade seven, but I soon found it a tedious task. I like the process of creating new symbols and adding new annotations on the chart, not drawing more stringlines on my diagram.

I wouldn’t even say that I am a railway fan; what I studied in high school and university were also unrelated with trains or timetables1. I don’t know much about railway operations, timetables, dispatching, trains, etc., and I only composed the features in the app based on what I saw from games such as OpenTTD, Transport Fever, A-Train, and prior art, including OuDia(Second) and qETRC.

So why did I write Paiagram, if I am not remotely related with railways? Beacuse I enjoy the process of creating, and I like structured systems, including transport. It didn’t matter if I lack a specifc piece of knowledge required for implementing a specific feature, because I can always learn as I write2. It didn’t matter if it takes a long time to finish the app. I enjoy the process anyways.

And I tried many new features in Paiagram. To name a few:

Some of which worked exceptionally well, though I am not sure if they introduce subtle bugs. Some of which were abandoned (e.g. bevy engine) as the development moved on.

Paiagram might be very buggy, but it has so many interesting features that may3 help you when scheduling. Enjoy!4

  1. I never followed my timetables. I skipped a lot of classes. ↩︎
  2. Except sometimes it doesn’t work. I think I’ll have to learn Japanese to understand those mysterious railway forum posts. ↩︎
  3. or may not ↩︎
  4. Or suffer! ↩︎