Red = High Speed Essos
Dark Green = Essos Main Line (including Essos Night)
Dark Blue = Free Cities Link
Pink = Valyrian Railways
Orange = Eastern Trains
Maroon = Dothraki Line
Yellow = Summer Island Railways
Light Blue = Ibbenese Trains
Purple = Qarth Connect
Black = Ferries

Red = High Speed Westeros
Dark Green = Westeros Main Line (including Westeros Night)
Dark Blue = Northline
Light Blue = Reach Rail
Yellow = Westerrail
Maroon = Riverlands Xpress
Orange = Kings Rail
Pink = Vale Trains
Light Green = Dornish Trains (metre gauge)
Purple = Storm Line
Black = Buses and ferries