Re: Vertapak cars, there were slots in the front and rear bumpers of the Vegas through which devices part of the car side were inserted to "tie-down" the auto for transport. And, yes, the idea was density. Railroads charged a per rail car tariff to move autos, so if you moved twice as many, the cost per vehicle was half as much. The fallacy here was that the Vertapak car cost a helluva lot more to build than a trilevel. Plus the auto had to be designed specifically for it.