It’s the Hornby Railroad Plus model purchased brand new and has a DCC ready chassis. Runs fine in my fiddleyard which is Peco code 100 and does run along the code 75 on the scenic section but rumbles along on the chairs/pandrol clips.
I see Ultrascale have replacement wheelsets available in brass or nickel silver, not sure which is better to be honest https://www.ultrascale.uk/eshop/products/view/CAT007/392