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Questions & Answers about O comboio vai para baixo.
I have seen the word trem for train. Why is it comboio here?
Comboio is the standard word for train in Portugal, whereas trem is used in Brazil. Since you are learning European Portuguese, you will hear and use comboio.
Why do we need para before baixo? Can't I just say O comboio vai baixo?
In Portuguese, baixo by itself means low. To express the direction of movement down or downwards, you need to combine para (to or towards) with baixo. Literally, it translates to goes towards the bottom.