A guy on my course sat in front of me and turned around to smile at me and did the same at the train station but I smiled akwardly, not convincing. Is he just being friendly or was he attracted to me?

No mind readers here. Only way for you to find out is to talk to him and go from there.

There's really not any answer to be found in a smile.

Next time you see him, why not try having a casual conversation with him and see if anything develops from there.

Sharing smiles is such a lovely experience. It's the first interaction my boyfriend and I ever shared-and it was memorable.

At any rate, none of us can tell you what this guy is thinking. Follow the advice given and strike up a conversation with him and see what happens. Good luck :)