It's not so different from the Soviets choosing an ever so slightly different caliber for their mortars so it's not compatible with the ones from NATO.
Can’t find the link now but I read a fascinating article about the German and Russian use of railways on the WW2 Eastern Front. Long story short IIRC: the Russian rail network was primitive by German standards, primarily lacking the automated signalling that allowed relatively high speed trains. Primitive, but it still worked and was very resilient to damage. The Russians destroyed a lot of their railways as they retreated and could quickly rebuild it when their fortunes changed.
Also, the Russians operated their trains using a centralised planning function that could prioritise strategically important routes and cargoes. In contrast, senior German commanders could in effect commandeer trains to support their local tactical needs, sometimes playing havoc with the overall network.
(note that if one has access to SWIFT data, one can not only watch the goods transported in one direction but also the payments flowing in the other.)
In other graphs, I believe California has (had?) superior petrol environmental standards to the rest of the US because its pipeline network is largely independent: https://www.api.org/~/media/Oil-and-Natural-Gas-images/Pipel...
In yet other graphs, Great War mobilisation was largely a function of the rail networks. To this day, it's possible to buy a "rail" ticket between finland and sweden that winds up "air gapped" via bus transfer.