By using rail maps of modern cities, people could play for their own modern day home town.
Instead of countries play for stations, and instead of continents play for lines.
This could be applied to cities all over the world.
Places like Merseyside (Where i live) that don't have a rail network as complex as others like London could have other public transport systems incorporated like main bus routes and Mersey Ferry river crossings.
I've never designed a map before so if this is rubbish i wont be surprised. However if anyone likes this idea i would appreciate any feed back to get it developed.