Here is a map containing all train and underground/metro connections for the Generation I and II Pokémon worlds. Originally only the magnet train between Goldenrod and Saffron existed, but as the population of the region exploded, a vast rail network was built. I took the population of the different cities into account and gave the four biggest cities an urban area. As Goldenrod is by far the biggest city in the region, it got its own underground line. The urban area of Celadon and Saffron combined is also quite big, so it definitely needed the additional urban line.



I found the map making tool on the Beno website and initially created a simple map for the Generation I and II Pokémon worlds. Then it got out of hand and I started adding stuff with Photoshop and here is the result.