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Well, the spanish S-120 EMU by CAF with changeable gauge is entering service now, after decades of similar devices on Talgo trains and on Transfesa refrigerator cars. This experience will hopefully extend to freight, but the problem is still the saturation of break-of-gauge stations, with trains waiting their turn. On the other hand, building new 5' gauge lines allows thru-running across borders. It's interesting that a catenary can be set at 20' from ground to allow double-stack containers, or fully laden lorries (so is the Eurotunnel too), but this would only be possible in the flat polish territory. We'll see!
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