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>they're constructed to very rigorous railway engineering standards
>what sort of-
>well, the front's not supposed to fall off for a start!
>what other things?
>well, er, there's regulations governing the materials they can be made out of
>what materials?
>well, cardboard's out.
>and?
>no cardboard derivatives.
>like paper..?
>no paper, no string no sellotape...