This article examines how the management of railway traffic was problematized in urban plans for colonial Delhi after the 1890s. It reveals how Delhi was reconstituted as a space of circulation in municipal plans attempting to combat railway-induced ‘traffic congestion’. Yet, even as new gardens, localities and footpaths were envisaged as enabling smooth flows of traffic and generating a commercially healthy city, policing anxieties and concerns over political security dominated in such plans. Finally, this article shows how the process of railway-inspired ‘urban planning’ was itself driven by a contestation between different ‘scales’ of the colonial state.