I have to throw in my two cents. I have the Fleischmann 130/2, and the 135/2.On the 135/2 it has that noise
but there's an oiler with a handle on the end cap. When you first put the steam to it, being cold, the steam
condenses in the cylinder with the piston slapping it. Open that valve just a crack to blead out the water
and she smooths right out. Don't leave it open, just a couple cycles.
On the 130/2 it got the plague, the zinc plague, bearing journals and flywheel. It wasn't pretty. It's fixed
now by hunting down the parts but it took quite a while. Now I'm not knocking Fleischmann's, they're beautiful.
If you're want to run it and run it hard, I'd go Jensen or Wilesco. They're still in business and parts are
readily available. I have a couple Jensens and several Wilescos, those are for, well, "STEAM IT LIKE YOU MEAN IT".
There's my two cents