You are welcome
Although I have been to the Helsinki station a couple of times, I don't recall the detail.
Malm? station has some 'archways' or rather dark, square openings between the platforms and the bright terminal building.
The following picture of Helsinki Station by night inspired me too:
Link:
http://julian.coccia.com/gallery/finland/IMG_0551
With a steady model, slow shutter speed and a flash on the model, you could make her 'pop out' of the crowd by night. The crowd from an arriving train could be a bit blurred and darker than the model, lit by say a frontal beauty disc. I like the warm colors and deep blue sky of the picture. Are there more shade in the area to the right on the platform.
For some reason, the image does not load in the preview, but try the link directly if it fails for you too.
Regards
Michael