2 hours is ICE which isn't a "normal" train to me, but even with regional trains it should only be around 4 hours. I'm not sure if the OP took the scenic route.

2 hours is ICE which isn't a "normal" train to me, but even with regional trains it should only be around 4 hours. I'm not sure if the OP took the scenic route. 200km was also a very optimistic guess, it's 300km. It looks close on the map but even in a car it will take you 3 hours. It's actually faster to go from Dresden.