Possibly the most abstract and colourful train route map I’ve ever seen. Looks like it’s from a commuter train in northern Poland (around Gdansk and Sopot). Major stations get a slightly bigger dot and their name in white. The overall effect is like a planet-heavy map of the solar system…
Source: szogun000/Flickr
Exactly, it’s from commuter rail Gdańsk – Sopot – Gdynia – Wejherowo (‘SKM Trójmiasto’ in Polish) and each colour indicates stations inside each city (red/pink – Gdańsk, orange/yellow – Sopot, blue – Gdynia, green – Rumia & Reda & Wejherowo).