Thanks. I cannot reproduce the bug you're reporting. Not in RIMS, not in MMT, and also not in MTS v1 or v2. Could you try and reproduce it in a clean install of vanilla OpenTTD with only RIMS?
I tried vanilla with only RIMS and in combination with Dutch Trainset 2.1.0. I also tried without dutch trainset but then it gives the error that no vehicles are available in 1875.
Vanilla seems to work fine with RIMS, it doesn't seem to occur...
I don't get this.
I made a screensnapshot of the problem, it's below:
The game is at 1915 now, Chinese Maglev and Brazilian Maglev carriages are in the purchase menu.
I'm still able to play the game correctly, it just looks a bit strange to me.
Thank you for reading.
It appeared to be the order in which my NewGRF was loaded, just found out!
That is Modern Maglev Trains. Iirc I specifically asked not to report bugs anymore. It is no longer being maintained, please use RIMS instead.