As gk said. Frankfurt Hbf is another terminal station where almost all long-distance trains (be them ICE or loco-pulled IC/EC) change direction, but don't end their run, and thus the time is short. Also true for most trains in Stuttgart Hbf, andmany in Munich Hbf.

To complicate matters, in Germany, many long-distance trains run in circuitous routes -- e.g. a train may run a big half-circle from Berlin through Dortmund Frankfurt, Stuttgart to Munich, then go North through Nuremburg to Hamburg; or alternatively through Leipzig back to Berlin... and in such a case, the "terminal station" is a matter of choice.

_{*Lunatic*, n.
One whose delusions are out of fashion.}