USSR had different railway gauge than Europe (it is actually still so for Russia and most of ex-USSR territories).
Soviet railways had width of 1520 mm, Europe was on 1435 mm.
Thus any railway carriages crossing USSR border had to change bogies - of course this was true for each direction of crossing.
In RL history during the war USSR managed to either evacuate or disable much of its rolling stock thus denying its use to Germans. AFAIK Germans decided to change gauge in occupied territories instead of building extra bogies for their railcars. This contributed to their supply problems during Barbarossa. Later on, when Soviet armies advanced into Europe they also faced the problem of gauge difference.
So, what I propose is some sort of "crossing gauge-size borders" negative multiplier that will apply to supply flows between territories with different railway gauges - i.e. Europe-USSR, USSR-Europe, USSR-China etc.
This is the present situation on width of railway gauges
Soviet railways had width of 1520 mm, Europe was on 1435 mm.
Thus any railway carriages crossing USSR border had to change bogies - of course this was true for each direction of crossing.
In RL history during the war USSR managed to either evacuate or disable much of its rolling stock thus denying its use to Germans. AFAIK Germans decided to change gauge in occupied territories instead of building extra bogies for their railcars. This contributed to their supply problems during Barbarossa. Later on, when Soviet armies advanced into Europe they also faced the problem of gauge difference.
So, what I propose is some sort of "crossing gauge-size borders" negative multiplier that will apply to supply flows between territories with different railway gauges - i.e. Europe-USSR, USSR-Europe, USSR-China etc.
This is the present situation on width of railway gauges
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