The tall buildings on both sides and in the distance create the perception of being hemmed in, almost a feeling of foreboding.
The figures are all silhouettes, all casting long shadows, all in a line, and overlapping with one another, almost suggesting they are linked - as though forming a "human tram", and an echo of the other trams.
While the two buildings on the left provide contrasting backgrounds for the trams - dark building behind the light tram and light building behind the shadow tram - I find them distracting, but I don’t really know how to avoid it. Perhaps I could have lightened the dark building to reduce the contrast.