Kuosmanen shot “Compartment No. 6? with a tiny crew in cramped spaces, and you can practically smell the matted hair, the jars of pickles, the physical details of a long train trip. Laura films ...

Her sensitive solo act turns into a lively, funny, seemingly incongruous duet soon after she settles into the cramped, dingy train compartment. Her home for much of the rest of the story ...