Slovak_Eagle Well, I'd focus on south part of Poland (Silesia, Opolskie, Lower Silesia and Lesser Poland). Why? Wrocław would fit to Praha - Poland route, so we can quickly make several borders and add Germany because of Goerlitz. Warsaw isn't important for me now. Warsaw would(and will!) take more time to make comparing to other cities.
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Enough talking, now some screenshots from WIP side of Silesia - Most Wisła junction with route to Zebrzydowice - Goczałkowice and route to Czechowice Dziedzice.