Move: WASD / Arrows.
Walk onto lit tiles to gather resources and reveal the fog.
Toggle Track mode, then walk to lay rail — cost depends on terrain (mountains need tunnels, rivers need bridges, marsh needs pilings).
Connect a resource tile to your Camp, then buy a Locomotive to automate the route.
Watch the boiler! Engines burn Wood + Water as they travel. Build Water Towers / Wood Depots along long routes, or they'll stall.