I found some likely typos in introduction dates for some vehicles. They are not serious, but can cause some confusion for new players, since they have some vehicles they can't use for anything. I can't even be 100 % sure they are typos, but rather extension points for add-ons. However, if the introduction year of 1825 for the Adler wagon is for the dawn of passenger railroads rather than a typo for 1835, same as the Adler itself, then the introduction month should be September rather than August. (For historical accuracy, the Adler should actually be introduced in December, according to Wikipedia, but that's a slightly different issue.)
It is also uncertain why Pferdebahn (the horses) are retired so long after Pferdebahnwagen. Lenient constraints make it possible to combine with some electric trams, but that makes no sense.