280 is for ICE. These are the local transport trains. U-bahn within city limits and S-Bahn within state limit. For example if i can give context, U bahn in Mumbai will serve only till Borivali or something and s-bahn will serve suburbs like Virar, Thane and Navi Mumbai.
S-bahn limit is 120kmph. U-bahn due to smaller distances between stations, i havent seen it going past 65kmph.