Railway Event Phase 1

My 6th survival map. Centered around building a large subway network to expand the world. In this phase there are 7 lines in total with one of which being an above rail line while the remaining 6 are all subterranean at level 27/28. The world itself is fairly bland, consisting of mostly plains, forests, and roofed forests surrounded by larger swampland and extreme hill biomes. Due to going back to school I will not have as much time to work on the map but hopefully I will eventually continue the map into phase 2 in which I will try to locate more unique biomes and expand the subway network even more as well as explore the new features of 1.8