As he says in the talk this truck is for 100 Pb, you'd need 10 of them for the aforementioned Exabyte (Eb); which I imagine would nicely equate to a train.

If this data is valuable though wouldn't it need to be securely transported; Mad Max: Fury Road springs to mind...

Increasingly the film Johnny Mnemonic is becoming more and more preposterous; it was 320 Gb in the film. I think the book was 320Mb.