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Hubs have effectively unlimited capacity, but your depots do not. It just tells you that both ends of the conveyor are plugged into something.
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If they do have bags to check, though, they'll head to a desk to drop them off. So if you have kiosks (and you should!), those pax are unlikely to use the baggage system. Speaking of ticketing desks, they're the only thing that puts baggage into the system.That by itself will save you a ton of space and spread. (You need one port for a two-way conveyor to connect to the rest of the network.) The same goes for baggage carousels: reset four or five of the ports to Consumer mode and attach up to 5 carousels per hub. When putting in your ticketing desks, for example, you can change five of the hub's ports to Producer ports, allowing you to connect 25 ticketing desks to a single port. So rather than being stuck with the default ports you see when you place a hub, you can change them to suit the hub's function. While you're limited to five objects on any single conveyor line, such as five ticketing desks, you can reset the hub's port assignments.
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WIth bookmark saves, you can prevent having to deal with expensive and time-consuming mistakes. Well, general advice off the top: save before starting and after building sections that worked out.
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