Its not sure what they include in the european side. Current european union+/- few countries, whole european continent?

If its continent including Russia, yes its about the same size, however i don't think it includes Russia, as in Russia and former soviet republics the distance between the tracks is wider than the rest of the Europe, probably similar to US. And btw, i kinda think distance between tracks is narrower in europe on purpose, so that Russian trains cannot use the european rails to transport heavy weapons, and viceversa.

If its only European Union, then Europe its also half the size of US.

The rest remains valid, although the narrow lines also support a lot of weight, and rail freight is certainly feasible and prefered to road freight.