Jonathan Seabourne here, chairman of the board of directors for OS&C along with a slew of other titles not worth mentioning.
We're always happy to help Sirius arrive wherever they're going in style and comfort, though I admit that it pains me to think of a magnificent liner reduced to a mere ore hauler! Still, I'd be lying if I said we didn't have ships being phased out of commission that wouldn't be an upgrade from your Pitbull. Every time I see one of those trains, I think that it's more rust than starship, but I digress.

The way I see it, there are two main options for wanting a luxury cargo liner (there's a sentence I thought I'd never type!). The Oasis class is the cheaper option and less maintenance intensive. We use them for our house to house commuter routes and they're designed to move people and cargo quickly and effectively with fewer amenities. However, they'd be a dramatic step down in terms of total cargo capacity compared to your train. A lot of the ship's internal bulkheads are structural, so you'd be looking at a massive refit of the vessel if you want something approaching a cavernous cargohold. The alternative is tucking your wares into individual staterooms, which is exceptionally labor intensive.

Your other option is, of course, my beloved Enterprise class. The whole fleet, including my Breezewood is admittedly approaching the end of their operational lives. BUT given the enhanced automation on Enterprise vessels, you could probably get the same total cargo space out of one as a Pittbull. Be advised that the Enterprise, as much as I love the class, handles like a brick with threading tradelanes being particularly problematic. It is NOT a vessel you pick if your intention is to do much fighting or running from said fight. It would also have the unusual side effect of giving your cargo many breathtaking views of Sirius as you fly through it, since most of the open space on the ship is taken up by observation lounges.

Of course, if you have no qualms working with Renzu instead of OS&C, you could always go for a Shukensha. They're designed with better armor and armament though at the expense of some cargo capacity. You'll have to contact our friends in Kusari about procuring one of those, however. Orbital doesn't have any liners that new which we are interested in decommissioning.

If you wish to purchase a used liner directly from us, you can speak to an agent on Baden Baden. If you require us to arrange purchase and delivery for you, I'm happy to facilitate that process. Let me know how I can best be of service.