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So for your mod I had to modify the code to force an 1800 start date, which is why I suggested the change.
There were horse trams before 1810, particularly in industrial freight service, and horse-drawn wagonways in 1700s (the Early Rail Series #1 mod starts them in 1800).
Apart from that, the early start year mod can change the start year of 1850-vehicles down to 1820.
https://psteamcommunity.yuanyoumao.com/workshop/filedetails/discussion/1958235092/4210371558768732191/
Tram : cargotram