Changtai Yangtze River Bridge

VERSION 1.0 OPTIONS - Two spatial diamond towers: four concrete legs splaying from two round footings to a crossbeam ring under the decks, then leaning in to one column that carries the stays. - Main span: the whole cable-stayed part, the stays fanning out on both sides of each tower. - Side spans as steel truss arches with cantilevers, after the crossing's 388 m channel bridges: arch ribs rising over the decks with hangers, haunches down to large portal piers (shorter side spans become plain truss spans). - Step-type caissons with an orange band at the waterline. - Double-deck steel Warren truss with a vertical at every node, cross frames and a ribbed lower deck. - Upper deck: road (town, country or highway) or rail (1 to 4 tracks, any type, with or without catenary). A two-way highway runs narrow over the bridge and widens to the standard highway near the ends. - Lower deck: road, rail, road + rail side by side behind a green wind screen, or nothing. Highways run both ways on one deck or one way on each. - Rail decks have a see-through steel grating floor, with the tracks laid directly on it. With catenary on the lower deck it drops to 20 m under the upper deck, so the masts clear. - Fans of white stays from the column to both edges of the girder, with guide pipes and dampers at the deck. - Main span (cable-stayed) 300-3000 m (real: 2156 m), side spans 0-900 m (real: 658 m) and end spans 0-300 m (real: 142 m), each set separately at each end, lower deck 30-110 m above the water. - Twin-column concrete portal piers at the side and end spans, each column on its own round caisson. - Arched deck: the deck can rise in an even curve from the ends, its grade set separately at each end (0-6%). - Curve: the whole bridge can bend left or right (radius down to 1500 m). - Roads and tracks on the bridge: free (upgrade roads, place signals) or locked to the bridge. - Night illumination (off, soft or bright) in rainbow or single colours: floodlit towers, glowing stays, light lines along the truss and arches, sodium deck lamps, caisson and navigation lights. - Blinking aircraft warning lights on the tower tops. - "Changtai approach" bridge types for building approaches with the road and track tools: the same light grey truss on twin concrete columns, and a rail version with the bridge's grated deck so tracks run on from it without a step. - New asset "Changtai bridge support" (Road assets > Misc): a pier or two-legged portal of any width and height, to add piers where the game leaves them out.