Looks like a 2016 or 2017 US Loco by LGB. These were coloured Green on the Cab, Water Tank and Tender. As they came with a Tender hence no rear step out to the Cab (for Coal Space)? This one may be a Special hence the Grey Colour. Sadly it is lacking the Tender, could have been quite valuable back in 1990’s (up to $500).I've got an old "American Stainz" stashed away somewhere. I never got round to fitting a DCC decoder so it wasn't run much, but at least I'm part of the "everyone must have one" club
Most folks on here already know their LGB history, but just for the benefit of any newcomers to the hobby who haven't yet studied it very deeply:Note, the first Stainz and Elias were called growlers and had a completely different motor than what is available now. Why called a growler? The motor and gears were very noisy thus the Growler name.