This really nice and rather rare HO gauge loco by Trix is 22410 a Bavarian PtL 2/2 steam locomotive in green livery with running number K.Bay.Sts.B 4531. 

The Class PtL 2/2 locomotives of the Royal Bavarian State Railways (Königlich Bayerische Staatseisenbahn) were light and very compact superheated steam locomotives for operation on Bavarian branch lines (known generally as Lokalbahnen).  The locomotives had a large driver's cab with 3 windows per side that surrounded the entire locomotive boiler as far as the smokebox. This unique feature earned it the nickname Glaskasten ("glass box") or, in Franconia, Glas-Chaise ("glass carriage")

There were three types in total, of which two were transferred to the Deutsche Reichsbahn-Gesellschaft as Class 98.3 tank locomotives and even survived to join the Deutsche Bundesbahn fleet after the Second World War.

In 1908 and 1909 Krauss supplied 29 locomotives with a conventional outside driving gear, which nevertheless used a jack shaft between the main axles. They were given locomotive numbers 4507 to 4535. This driving gear enabled the water tank to be located below the boiler in the frame, so that there was more space on the gangways.

Three further locomotives of this type were procured by the Prussian state railways in 1910 and were designated as the Prussian Class T 2.

The Deutsche Reichsbahn-Gesellschaft took over 22 locomotives, numbering them 98 301 - 98 322. Nine of these came from the first series with the jackshaft.

This tiny loco is in excellent condition as you can see in the pictures, it is tested and runs. A complete external visual inspection has shown the overall condition is good. The handrails need to be properly installed (they are just positioned in the pictures) The box is in good but perhaps a bit shelf worn condition. 

Overall this is a really nice scale locomotive and would look fantastic on a layout.

Do please have a look at my other listings, I typically have various HO and OO locos on offer as well as an extensive range of imported N gauge locos and other items. 

Note: I do recommend all locos are cleaned & serviced, as they have some age to them even if the quality looks at the highest level (fairly standard advice for all locos!).