Just for anyone’s information, I’ve decided to create a page on my Wiki page to track the status of the tramway network of Mainz including and major sources: User:ManuelB701/OpenHistoricalMap/Straßenbahn Mainz - OpenStreetMap Wiki
The main purpose is to keep track of the status of the individual lines as well as which sources were used (primarily to keep track of the major ones like books about the tramway itself and maps which show these) alongside some other other major events such as the electrification of the tramway.
Naturally WIP because I want to put more of the info into tables including deciding columns are important (though I’ll also note that I’d be a great idea to create some OHM specific templates like sources to make it easier to set up these tables).