Simutrans (2016)

Passengers will refuse a journey if your network cannot take them to their destination, giving connecting services a clear purpose. Stop information distinguishes overcrowding from a missing route, so the answer may be a new interchange rather than another bus. Rail, roads, ships and aircraft can work together across the same map. This free simulation has an older, detailed interface, and its different graphics and content sets also change the rules. Choose it for demand that tests the completeness of the system.