Last I had heard, the Rovos Train had derailed with many casualties. I am not sure if they are still in business.
Here in the US, in 2010-2011 Amtrak started allowing checked firearms somewhat like an airline. Before then, no.
They do not allow hunting dogs on the trains.
I use the California Zephyr, and Empire Builder out of Chicago, and get dropped off where my friends or guide can pick me up. I sleep well in a roomette. Mostly, it's a way to avoid the driving on return. Rooms are spartan. Meals are included.
I have access to a private railcar, and when I inquired about having it towed, Amtrak said they would be happy to. Regional freight haulers said No. So, I felt restricted to sidings adjacent to Amtrak tracks. If you have never ridden a train, tracks generally aren't running through sylvan glens. So, my Edwardian excursion would be experienced in "'da hood" for the most part.
I like traveling to hunting destinations via rail when it makes sense. It's a shame that Amtrak won't take dogs. That would make the whole process much more interesting.
At the present time, it is a way to avoid the drive, and have sex enroute.