As a commuting concept it sucks, because everyone has to commute in to the rail-head anyway. If the idea is successful, it will be so purely because it is popular, and therefore it is intrinsically self-defeating. The large infrastructure costs of a car-loading terminal mean there will be relatively few of them and they will act as bottlenecks, slowing each commuter both by their own need to be marshalled and loaded and by the need to wait for others until the train is full.

A much better concept is a similar train WITHOUT the car-carrying section. People drive to the railhead, park their automobile, board the passenger car (much quicker and safer than loading the railcars with vehicles). The train travels to the destination, optinally stopping at intermediate points to pickup/set down passengers.

At the destination, the passengers use a fleet of dedicated minibusses and cabs to disperse to subsidiary points around the city. With proper security for personnel and vehicles at the break-points this becomes secure and comfortable transport system. (Unfortunately, the economic managers of these systems oftem cut manpower from the security side of the system and them blame "criminal elements" for exploiting poorly-lit car parks where easy pickings are obviously to be had)

Oh, I forget. We already invented this.

The main reason it doesn't work well is that most people prefer to drive cars all the way (partly because of the security issues, and also because of the time flexibility they obtain), and the city streets are crowded with private cars seeking to find a cheap parking space, so the distributary part of the hub is less efficient than it should be.

With abundant transport capacity, trains become more attractive, but which city in the world has empty seats - even spare standing room - on their peak-hour trains?

In my city, there is a new tax on city car parking to try to encourage use of public trnasport. Combined with recent movements in the price of oil, this has made train transport so popular that the system is suddenly at capacity. Obviously, nobody thought about the possibility of success when they passed that tax! (or maybe they just did it to raise money without thinking about the implications, and the "encourage public transport" message was one of those political lies that make bad ideas sound good?)

Car ferries work OK for major land or sea crossings where you want your own car at the destination. But it's cheaper and quicker to fly and rent a car after quite a short distance, so it really only applies for e.g. holiday trips where your car is fully loaded with family and gear.