It's been a while since my last models. Here is a steam rail car made by Austrian company GANZ abot the beginning of the 20th century. The model was used in Bulgarian state railways between 1903 and 1929 under the name BDZ Series 200. The rail car had about 80 hp and achieved maximum speed of 50 km/h.
The model is designed for a motorization to run on a HO DC track. I'll post a link to the motorization kit. Herebelow, you can see the test runs of the car:
I also have to make the windows. I usualy print them on a DLP printer with a clear resin. Additional weight of about 200-250 grams must be added. I use lead from old car batteries and melt it on the stove, but be careful - lead vapors are poisonous and if you decide to do it - it is on your own risk.