Does this sentence mean, roughly, "Where does the train go?" that is, "What places are accessible to us by train?"
your dearth of up putting with that sentence structure is not something that I can claim to be fond of.
I saw the "til" on the end and ignored it because as a native English speaker I would never say "Where can we take the train to?"
Without "til" at the end, it means, "Where can we take the train?" "Where can we catch the train?" "Which is the right platform for us to catch the train we want?"
With "til", it means, "Where does the train go to?" or "Where can we go by train?"
I would say for example. we want to go to denmark by train, to where can we take the train? as in what places are possible to reach by train.