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The picture above describes a transportation system in use in Richmond in 1919. It got me thinking...Your challenge, if you choose to accept it, is to somehow enable Gustav Stresemann or equivalent pre-Nazi German leader to secure a demilitarized railroad connection to East Prussia in late 1920s using a system where the German railroad connection doesn't disturb the Polish traffic connections and rail line to Gdynia because it goes over (or under) it by using bridges/tunnels to go above/under the Polish railroads and major roads.
If such a connection could be secured before the Great Depression, how would it affect the German-Polish relations and the domestic politics of Germany?