They were suggesting they want to use the same vehicle door to door with it being automated during the freeway bit. A train would still mean find some transport to the station, wait for the train, ride train, find transport from station.

Or a train that takes cars, like a Ferry, obviously that massively cuts down on space efficiency but it’s not impossible.

Called a Motorail: https://en.wikipedia.org/wiki/Motorail

Like the euro tunnel