> ... such an efficiency powerhouse ...
I think this is just a cliché. There are a lot of examples in the public, the semi-public and the private sector were Germany is or became very inefficient or missed opportunities (long-distance trains, mobile phone prices and coverage, Berlin public administration, Berlin airport, Stuttgart train station, but also Deutsche Bank, Siemens, Bayer, BASF, not to speak of Quelle and Holzmann in the past).
However, one should not forget the special circumstances due to German reunification in the last 30+ years. In terms of GDP and population proportion it would be equivalent if the USA opened its border to Mexico today and gives all Mexicans US citizenship immediately. Than Mexico joins the USA 11 month later. After 10 years the USA gives up the US-Dollar for a Pan-American currency. For the 3 decades after the Mexico-USA unification the old USA transfers aprox. 2,000,000,000,000 to old Mexico. -- Perhaps this thought experiment makes it clear that it would have been more than a miracle if the high degree of efficiency that was associated with the old West-Germany could have been seamlessly continued into a reunified Germany. But allow the Germans another 34 years ...
Regarding long distance travelling (people as well as freight), Germany is also in a quite unique situation. It is in the center of major European long distance routes from every direction. In comparision even the traffic network topography of Austria and Switzerland is a lot simpler. In Austria it is North-South over the Brenner to Italy and NW-SE from Central Europe to South-East Europe. Switzerland is primarily NE-SW (Basel-Geneva) and a single major North-South train route (Zürich/Luzern-Lugano).
Just compare this map of the Swiss railway system (ignore the red lines, which are more or less only used for local transport):
https://de.wikipedia.org/wiki/Personenverkehr_in_der_Schweiz...
with that of Germany:
https://en.wikipedia.org/wiki/Rail_transport_in_Germany#/med...