They're implemented on the EU level but Germany isn't exactly unknown for pushing for them. The EP also likes to do it, the commission has more an eye on competition, sometimes those things overlap e.g. pushing train operators to finally implement a unified ticket shop (buying a trip from a single provider, even if the trains are run by different ones, has the consumer benefit that if a train is delayed and you miss a connection you can then take pretty much whatever train to reach your goal. And from the commission's perspective they want train operators to compete, but not by building walled gardens)