Rail, in-game: railtype available only if vehicle is available, "build infrastructure when not available" has no effect
Rail, scen-edit: never available

Road, in-game: roadtype available if vehicle is available. default road is also available if "build infrastructure when not available" is enabled
Road, scen-edit: roadtype available if vehicle is available at some date in the past or future. default road is always available

Tram, in-game: tramtype available if vehicle is available.
Tram, scen-edit: tramtype available if vehicle is available at some date in the past or future.

Canal, in-game: canal available if vehicle is available, or if "build infrastructure when not available" is enabled
Canal, scen-edit: always available

airport, in-game: airport avaialble if vehicle is available, or if "build infrastructure when not available" is enabled
airport, scen-edit: never available