When a map is created for a metro, subway, or raid transit system, colors are assigned to each line for identification. After creating the Global Subway Spectrum a few years ago which catalogs all these colors, I wanted to revisit the idea and create something new with updated data that transit fans like myself would enjoy hanging on their wall.

The result is Colors of the Rails, colors collected of official diagrams of metro lines and combined into a single graphic grouped by color family. Box sizes are based on the number of stations served by that line. Bigger boxes = more stations served.

An interactive diagram was created as a way to generate graphics for the posters and I had such a fun time using it that I've made it available to everyone to enjoy.