Collect public transport category theming per operator branding aside of line data

[TheOneWithTheBraid]

While displaying authentic and usable applications where users easily recognize their known means of transport, it might be useful to collect styling data of transport categories aside of the individual single lines too.

Example :

In Switzerland, all mainline train lines have lines (e.g. "IC 1"). In other countries, such as France or Austria, most mainline trains do not have dedicated lines ; at least not collected in schedule data. It would be amazing in future to still have styling data for product categories such as DB ICE, SNCF TGV inOui or OeBB nightjet collected somewhere as well.

I'd propose to start another dataset relating to the line data repository : Mapping of operator/region <-> transport category styling.

This could e.g. be :

• DB ICE : db-fernverkehr, Germany, ICE, ICE, #ec0016, #ffffff, italic
• SNCF TGV inOui : sncf, France, TGV, TGV inOui, #9b2743 , #5a5959
• SNCF TGV inOui : sncf-voyages-deutschland, Germany, TGV, TGV inOui, #9b2743 , #5a5959
• OeBB railjet : ...
• ZSSK EuroCity : ...

I'm not exactly sure about how to easily depict all this information, especially in order to avoid name/operator conflicts (SNCF TGV in France vs. TCDD TGV in Turkey), how to easily describe transport product branding in an abstract way but I'm sure there are more or less meaningful ways similar to the present per line mapping.

Maybe one could start some discussion and collect ideas for an appropriate data format to apply theming on means of transport without dedicated line data available.