@Thomas Hill: That was the initial idea behind it, but for a transport that was not going to get a hold size greater than 5000, and after some suggestions made by Igiss earlier in the thread, a size between the advanced train and the large train seems a good idea. It can be unarmed (or at least mostly) and still have a large hold even at that size.
Honestly, who would want a transport as big as a battleship if the hold is less than or equal to an advanced train, and it is unarmed to boot!? Now don't get the impression I have an issue with this, the design has simply changed according to needs.
@Angel of Mercy: I was kind of going for a more non-elegant ship for this one. Industrial and rustyish.