railroads / subways(underground railroads)
New Items -
Tier 1 - placeable railway tracks - its own perk (Choo Choo!) or a combination of Advanced engineering and Grease Monkey
Tier 2 - Build railway tracks(straight and corners only), handcarts - requires top level intellect + perk - wood/oil/steel?
Tier 3 - Build engine powered handcarts, switches, more sophisticated rail designs
Tier 4 - Build an storage cart ? you can place a forge and some chests and maybe a crafting bench. kinda like a small portable base you can bring around with you. attaches to t