Real-time train positions for 17 cities, built from public GTFS-RT feeds [OC] Visualization

What This Visualization Shows

This data visualization displays "Real-time train positions for 17 cities, built from public GTFS-RT feeds [OC]" and provides a clear visual representation of the underlying data patterns and trends. The visualization focuses on I built this because MetroBoard was $200, had a months-long waitlist, and only does one city. This one does 17, runs in the browser, and costs nothing beyond hardware I already had.

Every dot is a live train pulled from GTFS-RT feeds that transit agencies publish publicly. I process the static feed once into route geometry. The server polls the realtime feed every 12 seconds, matches vehicles to shapes, and returns positions. The frontend is a single SVG, no mapping library, no tiles.

SF, NYC, Chicago, Boston, DC, Seattle, Denver, Portland, Minneapolis, Toronto, Brisbane, and more. Some cities publish vehicle positions directly; others (NYC) only publish trip updates so I estimate location from upcoming stop sequences.

Live at [transit.henryratterman.com](http://transit.henryratterman.com)

, which allows us to understand complex relationships and insights within the data through visual storytelling.

Deep Dive into the Topic

This data visualization represents a sophisticated analysis of complex information patterns that provide valuable insights into underlying trends and relationships. Data visualization serves as a bridge between raw numerical data and human understanding, transforming abstract statistics into comprehensible visual narratives.

The power of data visualization lies in its ability to reveal patterns, outliers, and correlations that might not be apparent in traditional tabular formats. Through careful selection of chart types, color schemes, and interactive elements, effective visualizations can communicate complex information quickly and accurately to diverse audiences.

Modern data visualization combines statistical analysis with design principles to create compelling visual stories. This interdisciplinary approach requires understanding both the underlying data and the cognitive processes involved in visual perception. The result is more effective communication of quantitative insights that can inform decision-making and drive positive change.

Data Analysis and Insights

The patterns revealed in this visualization demonstrate the importance of systematic data analysis in understanding complex phenomena. By examining different data segments, time periods, and categorical breakdowns, we can identify trends that inform strategic planning and decision-making processes.

Statistical analysis of this data reveals variations across different dimensions that provide insights into underlying drivers and relationships. These patterns help identify areas of opportunity, potential risks, and key performance indicators that can guide future actions and resource allocation.

The analytical approach used in this visualization enables comparison across different categories, time periods, or geographic regions, revealing insights that support evidence-based decision-making. This type of analysis is essential for organizations seeking to optimize performance and understand complex market dynamics.

Significance and Applications

This data visualization has important implications for understanding trends and patterns that affect decision-making across multiple sectors. The insights derived from this analysis can inform policy development, business strategy, resource allocation, and operational improvements.

For analysts, researchers, and decision-makers, this type of data visualization provides essential insights for strategic planning and performance optimization. Whether addressing operational challenges, market analysis, or policy development, understanding data patterns helps create more effective strategies and solutions.

The broader significance lies in how this information contributes to our understanding of complex systems and relationships. This knowledge helps predict future trends, identify potential challenges, and develop more informed approaches to problem-solving and opportunity identification.