At Hamburg’s Elbbrücken station, the U4 waits at the city’s edge, its journey ending just short of the river it will one day cross. Sunlight glances off steel and glass, pooling on the checkered platform as passengers step aboard. For now, this is the terminus — a pause in the network’s growth — but soon the line will push further, carrying new stories and new faces into the city’s flow. Here, as in every frame of Urban Arteries, the tracks are the lifelines, and the trains the pulse.
