Guys...
I wrote to the Berlin marathon organisation to dsq prof. John Tanis.
just check the videos and you probably realize that the best american runner took the subway from km 10 to km 40..he is almost walking in the videos...before they disqualified him I checked the 5k and the 10k split, where he passed in 40 min and 1h 40 min, then he reached the km 40 at 45 km per hour....this is the real shame...