Original sentence: Among Berlin's 172 U-Bahn stations there are many with especially striking architecture or unusual design characteristics:.Opened in 1902, the  serves 172 stations spread across nine lines, with a total track length of , about 80% of which is underground
Edited sentence: Among Berlin's 173 U-Bahn stations there are many with especially striking architecture or unusual design characteristics:.Opened in 1902, the  serves 173 stations spread across nine lines, with a total track length of , about 80% of which is underground