Highway expansions usually leads to serious capacity reduction and therefore to more traffic jams and increased drive times. The difference to transit is really not that large. Transit lines will (in well run countries) always have replacement services. Possibly with some extra travel time but enough capacity.
Train control on upgraded or new corridors is done with ETCS and if it isn’t we are back to political will of doing it properly. Operation speed is of course determined by infrastructure but that is also the case for highways. Going beyond those specifications is also hard to impossible on highways.
Highway expansions usually leads to serious capacity reduction and therefore to more traffic jams and increased drive times. The difference to transit is really not that large. Transit lines will (in well run countries) always have replacement services. Possibly with some extra travel time but enough capacity.
Train control on upgraded or new corridors is done with ETCS and if it isn’t we are back to political will of doing it properly. Operation speed is of course determined by infrastructure but that is also the case for highways. Going beyond those specifications is also hard to impossible on highways.