NYC Subway Time-Space Diagram
Marey diagram visualizing subway trains as trajectories through spacetime. Vertical axis = stations along each line. Horizontal axis = time. Each angled line represents a train's journey.
Legend
On time
Slight delay (1-5 min)
Major delay (>5 min)
Current train position
About Marey Diagrams
A Marey diagram (named after French scientist Étienne-Jules Marey) plots position against time, creating a spacetime visualization. Each angled line represents a train's trajectory:
- Steeper slopes = faster trains
- Horizontal lines = trains stopped at stations
- Vertical distance = physical distance between stations
- Line color = delay status
This visualization makes it easy to spot delays, bunching, and gaps in service across the entire line at a glance.