Since I'm now (again) testing my Northern Europe 1862-2020 map, the "pain" of not finding decent freight engines before ca. 1903 or so, is, well... painful.

To me it seems like RRT3 makes many types available "too late" - am I wrong in this? Here's some data I found from the Wikipedia:
Year of being in commercial use in the USA:
2-6-0: 1860
2-6-2: 1900
0-8-0: 1844
2-8-0: 1866
2-8-2: 1884
4-8-0: 1882
0-10-0: 1868
2-10-0: 1867
You see the reason for my pain? ;) Right now, the only even remotely usable freight engine in RRT3 before 1903 or so is the 2-8-0 Consolidation. And yet, there could be at least these 8 types available far before that, if we aim for realism - am I right?
I'd suggest that we would have two versions of the "main classes" in the game. The first would be available as early as possible in the game -and the second "evolution version" later representing the class at its prime: more powerful, bigger, etc etc. This would be of enormous help, for example, in scenarios like my own Northern Europe and China Ultimate which cover many countries and the years from 1850..60 to 2020. It would also give us a clear upgrade path.
What do you guys think? I'm planning on making more of those "huge, long-time" maps available in the future: Africa, South America, Russia, ... Having all the basic classes available as early as possible would really make those scenarios more playable and interesting.

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