The film considers the parallel worlds within the carriages of an adjacent train, entering and leaving “Britain’s busiest railway station”. Most passengers merely pass through or interchange at the station, heading for other destinations. For these people the space of the station exists isolated from the world beyond, their view limited to that through their train window, or from the platforms and linking bridge. Figures are glimpsed through the windows of the parallel train, and their narratives imagined, before they slide off, the tracks diverging, separating the spaces that were momentarily drawn together by the infrastructure of the station.