What country are you thinking of? 4-4-4 locomotives were always rare beasts. The Metropolitan Railway had them for use on the tighter curves of the Met lines. The Class 'H', eight locomotives, - all went to the LNER in 1937 and the last was was withdrawn in 1947.
Ed Heaps has made one <KUID2:403746:808:11> for TS2019. They are nice models too. Other than that I don't know where you'd find a 4-4-4 loco.
I answered you on Discord...
But you are looking for a specific type of 4-4-4 locomotive. I offered English tank and you are looking for American tender type.