。
The train has just arrived.
Literal
Train [topic-は] just-now arrived [just-ばかり] [copula-です].
たばかり is the 'just (did) X' pattern — similar to たところだ but emphasizes the freshness of the action from the speaker's subjective viewpoint, not just the temporal position. 今着いたばかり doubles the 'just now' feel with both 今 and ばかり.