The picture depicts one car though. That would likely imply that you could send multiples though the tube, kind of like rail cars are sent along the rails.
The big thing is that these will travel much faster.
Look at the volume of the car, it is tiny compared to rail. Faster isn't a big help since we already have efficient air for that. Heck, we still use barges for cargo. Plus, the whole evacuated tube would play hell on cargo loading because of the added requirements. Speed buys very little given cargo is fine with traveling all night.
The big thing is that these will travel much faster.