You are moving the goalposts here. However if you want to compare mixed freight and passenger lines then rail equals many, many lanes.
Plenty of rail cars have room for luggage too or even baggage cars. Usually we are talking about people going to/from work however hence most people are not carrying lots.
Are you really saying your roads don't have shutdowns for maintenance? Or other problems? Also it is pretty rare for either roads nor railways to be fully utilised overnight. Also note that plenty of rail systems do run overnight.
Rail can support freight of course and complements trucks very well. Rapid transit can’t really support freight if it wants to operate at any reasonable frequency - you just can’t load any real quantity of freight in a few minutes. Even baggage is stretching it a lot of the time on busy lines. And the slow acceleration times and length of freight trains severely conflicts with the needs of passenger rail. Therefore, freight and passenger rail need to be separated for either to perform well. On the other hand, cars and trucks are a lot more similar in performance and size, so they can share the same roads just fine - it’s only an issue if the road is completely choked with trucks.
Plenty of rail cars have room for luggage too or even baggage cars. Usually we are talking about people going to/from work however hence most people are not carrying lots.
Are you really saying your roads don't have shutdowns for maintenance? Or other problems? Also it is pretty rare for either roads nor railways to be fully utilised overnight. Also note that plenty of rail systems do run overnight.